Commit | Line | Data |
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fac0d250 | 1 | /* dwarf2dbg.c - DWARF2 debug support |
82704155 | 2 | Copyright (C) 1999-2019 Free Software Foundation, Inc. |
fac0d250 RH |
3 | Contributed by David Mosberger-Tang <davidm@hpl.hp.com> |
4 | ||
5 | This file is part of GAS, the GNU Assembler. | |
6 | ||
7 | GAS is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
ec2655a6 | 9 | the Free Software Foundation; either version 3, or (at your option) |
fac0d250 RH |
10 | any later version. |
11 | ||
12 | GAS is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GAS; see the file COPYING. If not, write to the Free | |
4b4da160 NC |
19 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
20 | 02110-1301, USA. */ | |
fac0d250 | 21 | |
89b66cde | 22 | /* Logical line numbers can be controlled by the compiler via the |
bd0eb99b | 23 | following directives: |
fac0d250 RH |
24 | |
25 | .file FILENO "file.c" | |
ecea7679 | 26 | .loc FILENO LINENO [COLUMN] [basic_block] [prologue_end] \ |
92846e72 CC |
27 | [epilogue_begin] [is_stmt VALUE] [isa VALUE] \ |
28 | [discriminator VALUE] | |
bd0eb99b | 29 | */ |
fac0d250 | 30 | |
fac0d250 | 31 | #include "as.h" |
bd0eb99b | 32 | #include "safe-ctype.h" |
92eb7b32 | 33 | |
42dbf88c NC |
34 | #ifdef HAVE_LIMITS_H |
35 | #include <limits.h> | |
92625c16 | 36 | #else |
6717891c NC |
37 | #ifdef HAVE_SYS_PARAM_H |
38 | #include <sys/param.h> | |
39 | #endif | |
6256f9dd | 40 | #ifndef INT_MAX |
ee515fb7 | 41 | #define INT_MAX (int) (((unsigned) (-1)) >> 1) |
42dbf88c | 42 | #endif |
b8f080d6 | 43 | #endif |
42dbf88c | 44 | |
70658493 | 45 | #include "dwarf2dbg.h" |
a7ed1ca2 | 46 | #include <filenames.h> |
70658493 | 47 | |
56487c55 NC |
48 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM |
49 | /* We need to decide which character to use as a directory separator. | |
50 | Just because HAVE_DOS_BASED_FILE_SYSTEM is defined, it does not | |
51 | necessarily mean that the backslash character is the one to use. | |
52 | Some environments, eg Cygwin, can support both naming conventions. | |
53 | So we use the heuristic that we only need to use the backslash if | |
54 | the path is an absolute path starting with a DOS style drive | |
55 | selector. eg C: or D: */ | |
56 | # define INSERT_DIR_SEPARATOR(string, offset) \ | |
57 | do \ | |
58 | { \ | |
59 | if (offset > 1 \ | |
7fd3924a AM |
60 | && string[0] != 0 \ |
61 | && string[1] == ':') \ | |
56487c55 NC |
62 | string [offset] = '\\'; \ |
63 | else \ | |
64 | string [offset] = '/'; \ | |
65 | } \ | |
66 | while (0) | |
67 | #else | |
68 | # define INSERT_DIR_SEPARATOR(string, offset) string[offset] = '/' | |
69 | #endif | |
70 | ||
14e777e0 | 71 | #ifndef DWARF2_FORMAT |
413a266c | 72 | # define DWARF2_FORMAT(SEC) dwarf2_format_32bit |
14e777e0 KB |
73 | #endif |
74 | ||
9605f328 | 75 | #ifndef DWARF2_ADDR_SIZE |
e4475e39 | 76 | # define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8) |
9605f328 AO |
77 | #endif |
78 | ||
01e1a5bc NC |
79 | #ifndef DWARF2_FILE_NAME |
80 | #define DWARF2_FILE_NAME(FILENAME, DIRNAME) FILENAME | |
81 | #endif | |
82 | ||
83 | #ifndef DWARF2_FILE_TIME_NAME | |
84 | #define DWARF2_FILE_TIME_NAME(FILENAME,DIRNAME) 0 | |
85 | #endif | |
86 | ||
87 | #ifndef DWARF2_FILE_SIZE_NAME | |
88 | #define DWARF2_FILE_SIZE_NAME(FILENAME,DIRNAME) 0 | |
89 | #endif | |
90 | ||
fc0eebac TG |
91 | #ifndef DWARF2_VERSION |
92 | #define DWARF2_VERSION 2 | |
93 | #endif | |
94 | ||
88ebb0a1 MW |
95 | /* The .debug_aranges version has been 2 in DWARF version 2, 3 and 4. */ |
96 | #ifndef DWARF2_ARANGES_VERSION | |
97 | #define DWARF2_ARANGES_VERSION 2 | |
98 | #endif | |
99 | ||
8acbe8ff | 100 | /* This implementation outputs version 3 .debug_line information. */ |
88ebb0a1 | 101 | #ifndef DWARF2_LINE_VERSION |
8acbe8ff | 102 | #define DWARF2_LINE_VERSION 3 |
88ebb0a1 MW |
103 | #endif |
104 | ||
fac0d250 RH |
105 | #include "subsegs.h" |
106 | ||
fa8f86ff | 107 | #include "dwarf2.h" |
fac0d250 | 108 | |
fac0d250 RH |
109 | /* Since we can't generate the prolog until the body is complete, we |
110 | use three different subsegments for .debug_line: one holding the | |
111 | prolog, one for the directory and filename info, and one for the | |
112 | body ("statement program"). */ | |
113 | #define DL_PROLOG 0 | |
114 | #define DL_FILES 1 | |
115 | #define DL_BODY 2 | |
116 | ||
1737851b BW |
117 | /* If linker relaxation might change offsets in the code, the DWARF special |
118 | opcodes and variable-length operands cannot be used. If this macro is | |
119 | nonzero, use the DW_LNS_fixed_advance_pc opcode instead. */ | |
120 | #ifndef DWARF2_USE_FIXED_ADVANCE_PC | |
453dc3f0 | 121 | # define DWARF2_USE_FIXED_ADVANCE_PC linkrelax |
1737851b BW |
122 | #endif |
123 | ||
33eaf5de | 124 | /* First special line opcode - leave room for the standard opcodes. |
fac0d250 RH |
125 | Note: If you want to change this, you'll have to update the |
126 | "standard_opcode_lengths" table that is emitted below in | |
bd0eb99b RH |
127 | out_debug_line(). */ |
128 | #define DWARF2_LINE_OPCODE_BASE 13 | |
fac0d250 RH |
129 | |
130 | #ifndef DWARF2_LINE_BASE | |
131 | /* Minimum line offset in a special line info. opcode. This value | |
132 | was chosen to give a reasonable range of values. */ | |
133 | # define DWARF2_LINE_BASE -5 | |
134 | #endif | |
135 | ||
136 | /* Range of line offsets in a special line info. opcode. */ | |
137 | #ifndef DWARF2_LINE_RANGE | |
138 | # define DWARF2_LINE_RANGE 14 | |
139 | #endif | |
140 | ||
141 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH | |
142 | /* Define the architecture-dependent minimum instruction length (in | |
143 | bytes). This value should be rather too small than too big. */ | |
4dc7ead9 | 144 | # define DWARF2_LINE_MIN_INSN_LENGTH 1 |
fac0d250 RH |
145 | #endif |
146 | ||
bd0eb99b | 147 | /* Flag that indicates the initial value of the is_stmt_start flag. */ |
fac0d250 RH |
148 | #define DWARF2_LINE_DEFAULT_IS_STMT 1 |
149 | ||
cb30237e | 150 | /* Given a special op, return the line skip amount. */ |
fac0d250 RH |
151 | #define SPECIAL_LINE(op) \ |
152 | (((op) - DWARF2_LINE_OPCODE_BASE)%DWARF2_LINE_RANGE + DWARF2_LINE_BASE) | |
153 | ||
154 | /* Given a special op, return the address skip amount (in units of | |
155 | DWARF2_LINE_MIN_INSN_LENGTH. */ | |
156 | #define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) | |
157 | ||
cb30237e | 158 | /* The maximum address skip amount that can be encoded with a special op. */ |
fac0d250 RH |
159 | #define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) |
160 | ||
62ebcb5c AM |
161 | #ifndef TC_PARSE_CONS_RETURN_NONE |
162 | #define TC_PARSE_CONS_RETURN_NONE BFD_RELOC_NONE | |
163 | #endif | |
164 | ||
ba8826a8 AO |
165 | struct line_entry |
166 | { | |
220e750f | 167 | struct line_entry *next; |
07a53e5c | 168 | symbolS *label; |
220e750f | 169 | struct dwarf2_line_info loc; |
e6c774b4 | 170 | }; |
fac0d250 | 171 | |
ba8826a8 AO |
172 | /* Don't change the offset of next in line_entry. set_or_check_view |
173 | calls in dwarf2_gen_line_info_1 depend on it. */ | |
174 | static char unused[offsetof(struct line_entry, next) ? -1 : 1] | |
175 | ATTRIBUTE_UNUSED; | |
176 | ||
177 | struct line_subseg | |
178 | { | |
220e750f RH |
179 | struct line_subseg *next; |
180 | subsegT subseg; | |
181 | struct line_entry *head; | |
182 | struct line_entry **ptail; | |
e410add4 | 183 | struct line_entry **pmove_tail; |
220e750f | 184 | }; |
353e2c69 | 185 | |
ba8826a8 AO |
186 | struct line_seg |
187 | { | |
220e750f RH |
188 | struct line_seg *next; |
189 | segT seg; | |
190 | struct line_subseg *head; | |
191 | symbolS *text_start; | |
192 | symbolS *text_end; | |
193 | }; | |
194 | ||
195 | /* Collects data for all line table entries during assembly. */ | |
196 | static struct line_seg *all_segs; | |
1e9cc1c2 | 197 | static struct line_seg **last_seg_ptr; |
220e750f | 198 | |
ba8826a8 AO |
199 | struct file_entry |
200 | { | |
a7ed1ca2 | 201 | const char *filename; |
220e750f RH |
202 | unsigned int dir; |
203 | }; | |
204 | ||
205 | /* Table of files used by .debug_line. */ | |
206 | static struct file_entry *files; | |
207 | static unsigned int files_in_use; | |
208 | static unsigned int files_allocated; | |
209 | ||
a7ed1ca2 NC |
210 | /* Table of directories used by .debug_line. */ |
211 | static char **dirs; | |
212 | static unsigned int dirs_in_use; | |
213 | static unsigned int dirs_allocated; | |
214 | ||
b34976b6 | 215 | /* TRUE when we've seen a .loc directive recently. Used to avoid |
220e750f | 216 | doing work when there's nothing to do. */ |
1eee4adc | 217 | bfd_boolean dwarf2_loc_directive_seen; |
220e750f | 218 | |
07a53e5c RH |
219 | /* TRUE when we're supposed to set the basic block mark whenever a |
220 | label is seen. */ | |
221 | bfd_boolean dwarf2_loc_mark_labels; | |
222 | ||
220e750f | 223 | /* Current location as indicated by the most recent .loc directive. */ |
ba8826a8 AO |
224 | static struct dwarf2_line_info current = |
225 | { | |
bd0eb99b | 226 | 1, 1, 0, 0, |
92846e72 | 227 | DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, |
ba8826a8 | 228 | 0, NULL |
bd0eb99b | 229 | }; |
220e750f | 230 | |
ba8826a8 AO |
231 | /* This symbol is used to recognize view number forced resets in loc |
232 | lists. */ | |
233 | static symbolS *force_reset_view; | |
234 | ||
235 | /* This symbol evaluates to an expression that, if nonzero, indicates | |
236 | some view assert check failed. */ | |
237 | static symbolS *view_assert_failed; | |
238 | ||
220e750f RH |
239 | /* The size of an address on the target. */ |
240 | static unsigned int sizeof_address; | |
241 | \f | |
a2e22468 | 242 | static unsigned int get_filenum (const char *, unsigned int); |
413a266c | 243 | |
c5c0a210 | 244 | #ifndef TC_DWARF2_EMIT_OFFSET |
802f5d9e | 245 | #define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset |
c5c0a210 | 246 | |
6174d9c8 RH |
247 | /* Create an offset to .dwarf2_*. */ |
248 | ||
249 | static void | |
a2e22468 | 250 | generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) |
6174d9c8 | 251 | { |
91d6fa6a | 252 | expressionS exp; |
6174d9c8 | 253 | |
031e3350 | 254 | memset (&exp, 0, sizeof exp); |
91d6fa6a NC |
255 | exp.X_op = O_symbol; |
256 | exp.X_add_symbol = symbol; | |
257 | exp.X_add_number = 0; | |
258 | emit_expr (&exp, size); | |
6174d9c8 | 259 | } |
c5c0a210 | 260 | #endif |
6174d9c8 | 261 | |
e410add4 | 262 | /* Find or create (if CREATE_P) an entry for SEG+SUBSEG in ALL_SEGS. */ |
220e750f RH |
263 | |
264 | static struct line_subseg * | |
e410add4 | 265 | get_line_subseg (segT seg, subsegT subseg, bfd_boolean create_p) |
220e750f | 266 | { |
5f3fd8b4 | 267 | struct line_seg *s = seg_info (seg)->dwarf2_line_seg; |
91d6fa6a | 268 | struct line_subseg **pss, *lss; |
fac0d250 | 269 | |
1e9cc1c2 NC |
270 | if (s == NULL) |
271 | { | |
e410add4 RS |
272 | if (!create_p) |
273 | return NULL; | |
274 | ||
325801bd | 275 | s = XNEW (struct line_seg); |
1e9cc1c2 NC |
276 | s->next = NULL; |
277 | s->seg = seg; | |
278 | s->head = NULL; | |
279 | *last_seg_ptr = s; | |
280 | last_seg_ptr = &s->next; | |
5f3fd8b4 | 281 | seg_info (seg)->dwarf2_line_seg = s; |
1e9cc1c2 NC |
282 | } |
283 | gas_assert (seg == s->seg); | |
220e750f | 284 | |
91d6fa6a | 285 | for (pss = &s->head; (lss = *pss) != NULL ; pss = &lss->next) |
fac0d250 | 286 | { |
91d6fa6a | 287 | if (lss->subseg == subseg) |
ee515fb7 | 288 | goto found_subseg; |
91d6fa6a | 289 | if (lss->subseg > subseg) |
220e750f | 290 | break; |
fac0d250 | 291 | } |
220e750f | 292 | |
325801bd | 293 | lss = XNEW (struct line_subseg); |
91d6fa6a NC |
294 | lss->next = *pss; |
295 | lss->subseg = subseg; | |
296 | lss->head = NULL; | |
297 | lss->ptail = &lss->head; | |
e410add4 | 298 | lss->pmove_tail = &lss->head; |
91d6fa6a | 299 | *pss = lss; |
220e750f RH |
300 | |
301 | found_subseg: | |
91d6fa6a | 302 | return lss; |
fac0d250 RH |
303 | } |
304 | ||
ba8826a8 AO |
305 | /* (Un)reverse the line_entry list starting from H. */ |
306 | ||
307 | static struct line_entry * | |
308 | reverse_line_entry_list (struct line_entry *h) | |
309 | { | |
310 | struct line_entry *p = NULL, *e, *n; | |
311 | ||
312 | for (e = h; e; e = n) | |
313 | { | |
314 | n = e->next; | |
315 | e->next = p; | |
316 | p = e; | |
317 | } | |
318 | return p; | |
319 | } | |
320 | ||
321 | /* Compute the view for E based on the previous entry P. If we | |
322 | introduce an (undefined) view symbol for P, and H is given (P must | |
323 | be the tail in this case), introduce view symbols for earlier list | |
324 | entries as well, until one of them is constant. */ | |
325 | ||
326 | static void | |
327 | set_or_check_view (struct line_entry *e, struct line_entry *p, | |
328 | struct line_entry *h) | |
329 | { | |
330 | expressionS viewx; | |
331 | ||
332 | memset (&viewx, 0, sizeof (viewx)); | |
333 | viewx.X_unsigned = 1; | |
334 | ||
335 | /* First, compute !(E->label > P->label), to tell whether or not | |
336 | we're to reset the view number. If we can't resolve it to a | |
337 | constant, keep it symbolic. */ | |
338 | if (!p || (e->loc.view == force_reset_view && force_reset_view)) | |
339 | { | |
340 | viewx.X_op = O_constant; | |
341 | viewx.X_add_number = 0; | |
342 | viewx.X_add_symbol = NULL; | |
343 | viewx.X_op_symbol = NULL; | |
344 | } | |
345 | else | |
346 | { | |
347 | viewx.X_op = O_gt; | |
348 | viewx.X_add_number = 0; | |
349 | viewx.X_add_symbol = e->label; | |
350 | viewx.X_op_symbol = p->label; | |
351 | resolve_expression (&viewx); | |
352 | if (viewx.X_op == O_constant) | |
353 | viewx.X_add_number = !viewx.X_add_number; | |
354 | else | |
355 | { | |
356 | viewx.X_add_symbol = make_expr_symbol (&viewx); | |
357 | viewx.X_add_number = 0; | |
358 | viewx.X_op_symbol = NULL; | |
359 | viewx.X_op = O_logical_not; | |
360 | } | |
361 | } | |
362 | ||
363 | if (S_IS_DEFINED (e->loc.view) && symbol_constant_p (e->loc.view)) | |
364 | { | |
365 | expressionS *value = symbol_get_value_expression (e->loc.view); | |
366 | /* We can't compare the view numbers at this point, because in | |
367 | VIEWX we've only determined whether we're to reset it so | |
368 | far. */ | |
369 | if (viewx.X_op == O_constant) | |
370 | { | |
371 | if (!value->X_add_number != !viewx.X_add_number) | |
372 | as_bad (_("view number mismatch")); | |
373 | } | |
374 | /* Record the expression to check it later. It is the result of | |
375 | a logical not, thus 0 or 1. We just add up all such deferred | |
376 | expressions, and resolve it at the end. */ | |
377 | else if (!value->X_add_number) | |
378 | { | |
379 | symbolS *deferred = make_expr_symbol (&viewx); | |
380 | if (view_assert_failed) | |
381 | { | |
382 | expressionS chk; | |
031e3350 | 383 | |
ba8826a8 AO |
384 | memset (&chk, 0, sizeof (chk)); |
385 | chk.X_unsigned = 1; | |
386 | chk.X_op = O_add; | |
387 | chk.X_add_number = 0; | |
388 | chk.X_add_symbol = view_assert_failed; | |
389 | chk.X_op_symbol = deferred; | |
390 | deferred = make_expr_symbol (&chk); | |
391 | } | |
392 | view_assert_failed = deferred; | |
393 | } | |
394 | } | |
395 | ||
396 | if (viewx.X_op != O_constant || viewx.X_add_number) | |
397 | { | |
398 | expressionS incv; | |
399 | ||
400 | if (!p->loc.view) | |
401 | { | |
402 | p->loc.view = symbol_temp_make (); | |
403 | gas_assert (!S_IS_DEFINED (p->loc.view)); | |
404 | } | |
405 | ||
406 | memset (&incv, 0, sizeof (incv)); | |
407 | incv.X_unsigned = 1; | |
408 | incv.X_op = O_symbol; | |
409 | incv.X_add_symbol = p->loc.view; | |
410 | incv.X_add_number = 1; | |
411 | ||
412 | if (viewx.X_op == O_constant) | |
413 | { | |
414 | gas_assert (viewx.X_add_number == 1); | |
415 | viewx = incv; | |
416 | } | |
417 | else | |
418 | { | |
419 | viewx.X_add_symbol = make_expr_symbol (&viewx); | |
420 | viewx.X_add_number = 0; | |
421 | viewx.X_op_symbol = make_expr_symbol (&incv); | |
422 | viewx.X_op = O_multiply; | |
423 | } | |
424 | } | |
425 | ||
426 | if (!S_IS_DEFINED (e->loc.view)) | |
427 | { | |
428 | symbol_set_value_expression (e->loc.view, &viewx); | |
38cf168b | 429 | S_SET_SEGMENT (e->loc.view, expr_section); |
ba8826a8 AO |
430 | symbol_set_frag (e->loc.view, &zero_address_frag); |
431 | } | |
432 | ||
433 | /* Define and attempt to simplify any earlier views needed to | |
434 | compute E's. */ | |
435 | if (h && p && p->loc.view && !S_IS_DEFINED (p->loc.view)) | |
436 | { | |
437 | struct line_entry *h2; | |
438 | /* Reverse the list to avoid quadratic behavior going backwards | |
439 | in a single-linked list. */ | |
440 | struct line_entry *r = reverse_line_entry_list (h); | |
441 | ||
442 | gas_assert (r == p); | |
443 | /* Set or check views until we find a defined or absent view. */ | |
444 | do | |
62e6b7b3 AO |
445 | { |
446 | /* Do not define the head of a (sub?)segment view while | |
447 | handling others. It would be defined too early, without | |
448 | regard to the last view of other subsegments. | |
449 | set_or_check_view will be called for every head segment | |
450 | that needs it. */ | |
451 | if (r == h) | |
452 | break; | |
453 | set_or_check_view (r, r->next, NULL); | |
454 | } | |
ba8826a8 AO |
455 | while (r->next && r->next->loc.view && !S_IS_DEFINED (r->next->loc.view) |
456 | && (r = r->next)); | |
457 | ||
458 | /* Unreverse the list, so that we can go forward again. */ | |
459 | h2 = reverse_line_entry_list (p); | |
460 | gas_assert (h2 == h); | |
461 | ||
462 | /* Starting from the last view we just defined, attempt to | |
463 | simplify the view expressions, until we do so to P. */ | |
464 | do | |
465 | { | |
62e6b7b3 AO |
466 | /* The head view of a subsegment may remain undefined while |
467 | handling other elements, before it is linked to the last | |
468 | view of the previous subsegment. */ | |
469 | if (r == h) | |
470 | continue; | |
ba8826a8 AO |
471 | gas_assert (S_IS_DEFINED (r->loc.view)); |
472 | resolve_expression (symbol_get_value_expression (r->loc.view)); | |
473 | } | |
474 | while (r != p && (r = r->next)); | |
475 | ||
476 | /* Now that we've defined and computed all earlier views that might | |
477 | be needed to compute E's, attempt to simplify it. */ | |
478 | resolve_expression (symbol_get_value_expression (e->loc.view)); | |
479 | } | |
480 | } | |
481 | ||
6a50d470 | 482 | /* Record an entry for LOC occurring at LABEL. */ |
07a53e5c RH |
483 | |
484 | static void | |
6a50d470 | 485 | dwarf2_gen_line_info_1 (symbolS *label, struct dwarf2_line_info *loc) |
07a53e5c | 486 | { |
6a50d470 | 487 | struct line_subseg *lss; |
07a53e5c RH |
488 | struct line_entry *e; |
489 | ||
325801bd | 490 | e = XNEW (struct line_entry); |
07a53e5c | 491 | e->next = NULL; |
6a50d470 | 492 | e->label = label; |
07a53e5c RH |
493 | e->loc = *loc; |
494 | ||
e410add4 | 495 | lss = get_line_subseg (now_seg, now_subseg, TRUE); |
ba8826a8 | 496 | |
62e6b7b3 AO |
497 | /* Subseg heads are chained to previous subsegs in |
498 | dwarf2_finish. */ | |
499 | if (loc->view && lss->head) | |
ba8826a8 | 500 | set_or_check_view (e, |
62e6b7b3 | 501 | (struct line_entry *)lss->ptail, |
ba8826a8 AO |
502 | lss->head); |
503 | ||
6a50d470 RS |
504 | *lss->ptail = e; |
505 | lss->ptail = &e->next; | |
07a53e5c RH |
506 | } |
507 | ||
436d9e46 | 508 | /* Record an entry for LOC occurring at OFS within the current fragment. */ |
353e2c69 | 509 | |
220e750f | 510 | void |
a2e22468 | 511 | dwarf2_gen_line_info (addressT ofs, struct dwarf2_line_info *loc) |
fac0d250 | 512 | { |
1ea5c325 MS |
513 | static unsigned int line = -1; |
514 | static unsigned int filenum = -1; | |
220e750f | 515 | |
6a50d470 RS |
516 | symbolS *sym; |
517 | ||
220e750f RH |
518 | /* Early out for as-yet incomplete location information. */ |
519 | if (loc->filenum == 0 || loc->line == 0) | |
520 | return; | |
521 | ||
ffa554ed GK |
522 | /* Don't emit sequences of line symbols for the same line when the |
523 | symbols apply to assembler code. It is necessary to emit | |
524 | duplicate line symbols when a compiler asks for them, because GDB | |
525 | uses them to determine the end of the prologue. */ | |
d1a6c242 | 526 | if (debug_type == DEBUG_DWARF2 |
ffa554ed | 527 | && line == loc->line && filenum == loc->filenum) |
1ea5c325 MS |
528 | return; |
529 | ||
530 | line = loc->line; | |
531 | filenum = loc->filenum; | |
532 | ||
453dc3f0 NC |
533 | if (linkrelax) |
534 | { | |
535 | char name[120]; | |
536 | ||
537 | /* Use a non-fake name for the line number location, | |
538 | so that it can be referred to by relocations. */ | |
539 | sprintf (name, ".Loc.%u.%u", line, filenum); | |
6a50d470 | 540 | sym = symbol_new (name, now_seg, ofs, frag_now); |
453dc3f0 NC |
541 | } |
542 | else | |
6a50d470 RS |
543 | sym = symbol_temp_new (now_seg, ofs, frag_now); |
544 | dwarf2_gen_line_info_1 (sym, loc); | |
220e750f | 545 | } |
fac0d250 | 546 | |
ecea7679 RH |
547 | /* Returns the current source information. If .file directives have |
548 | been encountered, the info for the corresponding source file is | |
549 | returned. Otherwise, the info for the assembly source file is | |
550 | returned. */ | |
551 | ||
220e750f | 552 | void |
a2e22468 | 553 | dwarf2_where (struct dwarf2_line_info *line) |
220e750f RH |
554 | { |
555 | if (debug_type == DEBUG_DWARF2) | |
fac0d250 | 556 | { |
ba8826a8 AO |
557 | const char *filename; |
558 | ||
559 | memset (line, 0, sizeof (*line)); | |
560 | filename = as_where (&line->line); | |
a7ed1ca2 | 561 | line->filenum = get_filenum (filename, 0); |
220e750f | 562 | line->column = 0; |
bd0eb99b | 563 | line->flags = DWARF2_FLAG_IS_STMT; |
ecea7679 | 564 | line->isa = current.isa; |
92846e72 | 565 | line->discriminator = current.discriminator; |
ba8826a8 | 566 | line->view = NULL; |
fac0d250 | 567 | } |
220e750f RH |
568 | else |
569 | *line = current; | |
fac0d250 RH |
570 | } |
571 | ||
7fd3924a | 572 | /* A hook to allow the target backend to inform the line number state |
ecea7679 RH |
573 | machine of isa changes when assembler debug info is enabled. */ |
574 | ||
575 | void | |
576 | dwarf2_set_isa (unsigned int isa) | |
577 | { | |
578 | current.isa = isa; | |
579 | } | |
580 | ||
220e750f RH |
581 | /* Called for each machine instruction, or relatively atomic group of |
582 | machine instructions (ie built-in macro). The instruction or group | |
583 | is SIZE bytes in length. If dwarf2 line number generation is called | |
584 | for, emit a line statement appropriately. */ | |
353e2c69 | 585 | |
220e750f | 586 | void |
a2e22468 | 587 | dwarf2_emit_insn (int size) |
fac0d250 | 588 | { |
220e750f | 589 | struct dwarf2_line_info loc; |
fac0d250 | 590 | |
ba8826a8 AO |
591 | if (debug_type != DEBUG_DWARF2 |
592 | ? !dwarf2_loc_directive_seen | |
593 | : !seen_at_least_1_file ()) | |
220e750f | 594 | return; |
7fd3924a AM |
595 | |
596 | dwarf2_where (&loc); | |
b6675117 | 597 | |
71250b94 | 598 | dwarf2_gen_line_info ((frag_now_fix_octets () - size) / OCTETS_PER_BYTE, &loc); |
661ba50f BW |
599 | dwarf2_consume_line_info (); |
600 | } | |
601 | ||
e410add4 RS |
602 | /* Move all previously-emitted line entries for the current position by |
603 | DELTA bytes. This function cannot be used to move the same entries | |
604 | twice. */ | |
605 | ||
606 | void | |
607 | dwarf2_move_insn (int delta) | |
608 | { | |
609 | struct line_subseg *lss; | |
610 | struct line_entry *e; | |
611 | valueT now; | |
612 | ||
613 | if (delta == 0) | |
614 | return; | |
615 | ||
616 | lss = get_line_subseg (now_seg, now_subseg, FALSE); | |
617 | if (!lss) | |
618 | return; | |
619 | ||
620 | now = frag_now_fix (); | |
621 | while ((e = *lss->pmove_tail)) | |
622 | { | |
623 | if (S_GET_VALUE (e->label) == now) | |
624 | S_SET_VALUE (e->label, now + delta); | |
625 | lss->pmove_tail = &e->next; | |
626 | } | |
627 | } | |
628 | ||
661ba50f BW |
629 | /* Called after the current line information has been either used with |
630 | dwarf2_gen_line_info or saved with a machine instruction for later use. | |
631 | This resets the state of the line number information to reflect that | |
632 | it has been used. */ | |
633 | ||
634 | void | |
635 | dwarf2_consume_line_info (void) | |
636 | { | |
637 | /* Unless we generate DWARF2 debugging information for each | |
638 | assembler line, we only emit one line symbol for one LOC. */ | |
7fd3924a | 639 | dwarf2_loc_directive_seen = FALSE; |
bd0eb99b RH |
640 | |
641 | current.flags &= ~(DWARF2_FLAG_BASIC_BLOCK | |
642 | | DWARF2_FLAG_PROLOGUE_END | |
643 | | DWARF2_FLAG_EPILOGUE_BEGIN); | |
92846e72 | 644 | current.discriminator = 0; |
3a00b02d | 645 | current.view = NULL; |
220e750f | 646 | } |
fac0d250 | 647 | |
07a53e5c RH |
648 | /* Called for each (preferably code) label. If dwarf2_loc_mark_labels |
649 | is enabled, emit a basic block marker. */ | |
650 | ||
651 | void | |
652 | dwarf2_emit_label (symbolS *label) | |
653 | { | |
654 | struct dwarf2_line_info loc; | |
655 | ||
656 | if (!dwarf2_loc_mark_labels) | |
657 | return; | |
658 | if (S_GET_SEGMENT (label) != now_seg) | |
659 | return; | |
660 | if (!(bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE)) | |
661 | return; | |
7fd3924a AM |
662 | if (files_in_use == 0 && debug_type != DEBUG_DWARF2) |
663 | return; | |
664 | ||
665 | dwarf2_where (&loc); | |
07a53e5c RH |
666 | |
667 | loc.flags |= DWARF2_FLAG_BASIC_BLOCK; | |
668 | ||
6a50d470 | 669 | dwarf2_gen_line_info_1 (label, &loc); |
7fd3924a | 670 | dwarf2_consume_line_info (); |
07a53e5c RH |
671 | } |
672 | ||
a7ed1ca2 NC |
673 | /* Get a .debug_line file number for FILENAME. If NUM is nonzero, |
674 | allocate it on that file table slot, otherwise return the first | |
675 | empty one. */ | |
220e750f RH |
676 | |
677 | static unsigned int | |
a2e22468 | 678 | get_filenum (const char *filename, unsigned int num) |
220e750f | 679 | { |
a7ed1ca2 NC |
680 | static unsigned int last_used, last_used_dir_len; |
681 | const char *file; | |
682 | size_t dir_len; | |
683 | unsigned int i, dir; | |
220e750f | 684 | |
a7ed1ca2 NC |
685 | if (num == 0 && last_used) |
686 | { | |
687 | if (! files[last_used].dir | |
8b6efd89 | 688 | && filename_cmp (filename, files[last_used].filename) == 0) |
a7ed1ca2 NC |
689 | return last_used; |
690 | if (files[last_used].dir | |
8b6efd89 KT |
691 | && filename_ncmp (filename, dirs[files[last_used].dir], |
692 | last_used_dir_len) == 0 | |
a7ed1ca2 | 693 | && IS_DIR_SEPARATOR (filename [last_used_dir_len]) |
8b6efd89 KT |
694 | && filename_cmp (filename + last_used_dir_len + 1, |
695 | files[last_used].filename) == 0) | |
a7ed1ca2 NC |
696 | return last_used; |
697 | } | |
220e750f | 698 | |
a7ed1ca2 NC |
699 | file = lbasename (filename); |
700 | /* Don't make empty string from / or A: from A:/ . */ | |
701 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM | |
702 | if (file <= filename + 3) | |
703 | file = filename; | |
704 | #else | |
705 | if (file == filename + 1) | |
706 | file = filename; | |
707 | #endif | |
708 | dir_len = file - filename; | |
709 | ||
710 | dir = 0; | |
711 | if (dir_len) | |
712 | { | |
01e1a5bc | 713 | #ifndef DWARF2_DIR_SHOULD_END_WITH_SEPARATOR |
a7ed1ca2 | 714 | --dir_len; |
01e1a5bc | 715 | #endif |
a7ed1ca2 | 716 | for (dir = 1; dir < dirs_in_use; ++dir) |
8b6efd89 | 717 | if (filename_ncmp (filename, dirs[dir], dir_len) == 0 |
a7ed1ca2 NC |
718 | && dirs[dir][dir_len] == '\0') |
719 | break; | |
720 | ||
721 | if (dir >= dirs_in_use) | |
722 | { | |
723 | if (dir >= dirs_allocated) | |
724 | { | |
725 | dirs_allocated = dir + 32; | |
325801bd | 726 | dirs = XRESIZEVEC (char *, dirs, dirs_allocated); |
a7ed1ca2 NC |
727 | } |
728 | ||
29a2809e | 729 | dirs[dir] = xmemdup0 (filename, dir_len); |
a7ed1ca2 NC |
730 | dirs_in_use = dir + 1; |
731 | } | |
732 | } | |
733 | ||
734 | if (num == 0) | |
735 | { | |
736 | for (i = 1; i < files_in_use; ++i) | |
737 | if (files[i].dir == dir | |
88b4ca40 | 738 | && files[i].filename |
8b6efd89 | 739 | && filename_cmp (file, files[i].filename) == 0) |
a7ed1ca2 NC |
740 | { |
741 | last_used = i; | |
742 | last_used_dir_len = dir_len; | |
743 | return i; | |
744 | } | |
745 | } | |
746 | else | |
747 | i = num; | |
220e750f RH |
748 | |
749 | if (i >= files_allocated) | |
fac0d250 | 750 | { |
249e3833 RH |
751 | unsigned int old = files_allocated; |
752 | ||
220e750f | 753 | files_allocated = i + 32; |
3076e594 NC |
754 | /* Catch wraparound. */ |
755 | if (files_allocated <= old) | |
756 | { | |
757 | as_bad (_("file number %u is too big"), i); | |
758 | return 0; | |
759 | } | |
249e3833 | 760 | |
3076e594 | 761 | files = XRESIZEVEC (struct file_entry, files, files_allocated); |
249e3833 | 762 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); |
fac0d250 RH |
763 | } |
764 | ||
a7ed1ca2 NC |
765 | files[i].filename = num ? file : xstrdup (file); |
766 | files[i].dir = dir; | |
10cd14b4 AM |
767 | if (files_in_use < i + 1) |
768 | files_in_use = i + 1; | |
220e750f | 769 | last_used = i; |
a7ed1ca2 | 770 | last_used_dir_len = dir_len; |
220e750f RH |
771 | |
772 | return i; | |
773 | } | |
fac0d250 | 774 | |
ecb4347a DJ |
775 | /* Handle two forms of .file directive: |
776 | - Pass .file "source.c" to s_app_file | |
777 | - Handle .file 1 "source.c" by adding an entry to the DWARF-2 file table | |
220e750f | 778 | |
68d20676 | 779 | If an entry is added to the file table, return a pointer to the filename. */ |
ecb4347a DJ |
780 | |
781 | char * | |
68d20676 | 782 | dwarf2_directive_filename (void) |
220e750f RH |
783 | { |
784 | offsetT num; | |
e46d99eb | 785 | char *filename; |
220e750f RH |
786 | int filename_len; |
787 | ||
788 | /* Continue to accept a bare string and pass it off. */ | |
789 | SKIP_WHITESPACE (); | |
790 | if (*input_line_pointer == '"') | |
fac0d250 | 791 | { |
220e750f | 792 | s_app_file (0); |
ecb4347a | 793 | return NULL; |
fac0d250 RH |
794 | } |
795 | ||
220e750f RH |
796 | num = get_absolute_expression (); |
797 | filename = demand_copy_C_string (&filename_len); | |
bd0eb99b RH |
798 | if (filename == NULL) |
799 | return NULL; | |
220e750f RH |
800 | demand_empty_rest_of_line (); |
801 | ||
249e3833 | 802 | if (num < 1) |
fac0d250 | 803 | { |
0e389e77 | 804 | as_bad (_("file number less than one")); |
ecb4347a | 805 | return NULL; |
fac0d250 RH |
806 | } |
807 | ||
7cadeb2c AM |
808 | /* A .file directive implies compiler generated debug information is |
809 | being supplied. Turn off gas generated debug info. */ | |
810 | debug_type = DEBUG_NONE; | |
811 | ||
3076e594 | 812 | if (num < (offsetT) files_in_use && files[num].filename != 0) |
220e750f | 813 | { |
0e389e77 | 814 | as_bad (_("file number %ld already allocated"), (long) num); |
ecb4347a | 815 | return NULL; |
249e3833 | 816 | } |
3076e594 NC |
817 | else if (num < 0) |
818 | { | |
819 | as_bad (_("file number %ld is too small!"), (long) num); | |
820 | return NULL; | |
821 | } | |
220e750f | 822 | |
3076e594 | 823 | get_filenum (filename, (unsigned int) num); |
ecb4347a DJ |
824 | |
825 | return filename; | |
fac0d250 RH |
826 | } |
827 | ||
68d20676 NC |
828 | /* Calls dwarf2_directive_filename, but discards its result. |
829 | Used in pseudo-op tables where the function result is ignored. */ | |
830 | ||
831 | void | |
832 | dwarf2_directive_file (int dummy ATTRIBUTE_UNUSED) | |
833 | { | |
834 | (void) dwarf2_directive_filename (); | |
835 | } | |
836 | ||
220e750f | 837 | void |
a2e22468 | 838 | dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED) |
220e750f | 839 | { |
ecea7679 RH |
840 | offsetT filenum, line; |
841 | ||
851feff8 DJ |
842 | /* If we see two .loc directives in a row, force the first one to be |
843 | output now. */ | |
7cadeb2c | 844 | if (dwarf2_loc_directive_seen) |
6a50d470 | 845 | dwarf2_emit_insn (0); |
851feff8 | 846 | |
ecea7679 RH |
847 | filenum = get_absolute_expression (); |
848 | SKIP_WHITESPACE (); | |
849 | line = get_absolute_expression (); | |
850 | ||
851 | if (filenum < 1) | |
852 | { | |
853 | as_bad (_("file number less than one")); | |
854 | return; | |
855 | } | |
856 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) | |
857 | { | |
858 | as_bad (_("unassigned file number %ld"), (long) filenum); | |
859 | return; | |
860 | } | |
861 | ||
862 | current.filenum = filenum; | |
863 | current.line = line; | |
92846e72 | 864 | current.discriminator = 0; |
ecea7679 RH |
865 | |
866 | #ifndef NO_LISTING | |
867 | if (listing) | |
868 | { | |
869 | if (files[filenum].dir) | |
870 | { | |
871 | size_t dir_len = strlen (dirs[files[filenum].dir]); | |
872 | size_t file_len = strlen (files[filenum].filename); | |
add39d23 | 873 | char *cp = XNEWVEC (char, dir_len + 1 + file_len + 1); |
ecea7679 RH |
874 | |
875 | memcpy (cp, dirs[files[filenum].dir], dir_len); | |
56487c55 | 876 | INSERT_DIR_SEPARATOR (cp, dir_len); |
ecea7679 RH |
877 | memcpy (cp + dir_len + 1, files[filenum].filename, file_len); |
878 | cp[dir_len + file_len + 1] = '\0'; | |
879 | listing_source_file (cp); | |
e1fa0163 | 880 | free (cp); |
ecea7679 RH |
881 | } |
882 | else | |
883 | listing_source_file (files[filenum].filename); | |
884 | listing_source_line (line); | |
885 | } | |
886 | #endif | |
887 | ||
220e750f | 888 | SKIP_WHITESPACE (); |
ecea7679 RH |
889 | if (ISDIGIT (*input_line_pointer)) |
890 | { | |
891 | current.column = get_absolute_expression (); | |
892 | SKIP_WHITESPACE (); | |
893 | } | |
894 | ||
895 | while (ISALPHA (*input_line_pointer)) | |
220e750f | 896 | { |
bd0eb99b RH |
897 | char *p, c; |
898 | offsetT value; | |
899 | ||
d02603dc | 900 | c = get_symbol_name (& p); |
bd0eb99b RH |
901 | |
902 | if (strcmp (p, "basic_block") == 0) | |
903 | { | |
904 | current.flags |= DWARF2_FLAG_BASIC_BLOCK; | |
905 | *input_line_pointer = c; | |
906 | } | |
907 | else if (strcmp (p, "prologue_end") == 0) | |
908 | { | |
909 | current.flags |= DWARF2_FLAG_PROLOGUE_END; | |
910 | *input_line_pointer = c; | |
911 | } | |
912 | else if (strcmp (p, "epilogue_begin") == 0) | |
913 | { | |
914 | current.flags |= DWARF2_FLAG_EPILOGUE_BEGIN; | |
915 | *input_line_pointer = c; | |
916 | } | |
917 | else if (strcmp (p, "is_stmt") == 0) | |
918 | { | |
d02603dc | 919 | (void) restore_line_pointer (c); |
bd0eb99b RH |
920 | value = get_absolute_expression (); |
921 | if (value == 0) | |
922 | current.flags &= ~DWARF2_FLAG_IS_STMT; | |
923 | else if (value == 1) | |
924 | current.flags |= DWARF2_FLAG_IS_STMT; | |
925 | else | |
ecea7679 RH |
926 | { |
927 | as_bad (_("is_stmt value not 0 or 1")); | |
928 | return; | |
929 | } | |
bd0eb99b RH |
930 | } |
931 | else if (strcmp (p, "isa") == 0) | |
932 | { | |
d02603dc | 933 | (void) restore_line_pointer (c); |
bd0eb99b | 934 | value = get_absolute_expression (); |
ecea7679 | 935 | if (value >= 0) |
bd0eb99b | 936 | current.isa = value; |
ecea7679 RH |
937 | else |
938 | { | |
939 | as_bad (_("isa number less than zero")); | |
940 | return; | |
941 | } | |
bd0eb99b | 942 | } |
92846e72 CC |
943 | else if (strcmp (p, "discriminator") == 0) |
944 | { | |
d02603dc | 945 | (void) restore_line_pointer (c); |
92846e72 CC |
946 | value = get_absolute_expression (); |
947 | if (value >= 0) | |
948 | current.discriminator = value; | |
949 | else | |
950 | { | |
951 | as_bad (_("discriminator less than zero")); | |
952 | return; | |
953 | } | |
954 | } | |
ba8826a8 AO |
955 | else if (strcmp (p, "view") == 0) |
956 | { | |
957 | symbolS *sym; | |
958 | ||
959 | (void) restore_line_pointer (c); | |
960 | SKIP_WHITESPACE (); | |
961 | ||
962 | if (ISDIGIT (*input_line_pointer) | |
963 | || *input_line_pointer == '-') | |
964 | { | |
965 | bfd_boolean force_reset = *input_line_pointer == '-'; | |
966 | ||
967 | value = get_absolute_expression (); | |
968 | if (value != 0) | |
969 | { | |
970 | as_bad (_("numeric view can only be asserted to zero")); | |
971 | return; | |
972 | } | |
973 | if (force_reset && force_reset_view) | |
974 | sym = force_reset_view; | |
975 | else | |
976 | { | |
977 | sym = symbol_temp_new (absolute_section, value, | |
978 | &zero_address_frag); | |
979 | if (force_reset) | |
980 | force_reset_view = sym; | |
981 | } | |
982 | } | |
983 | else | |
984 | { | |
985 | char *name = read_symbol_name (); | |
986 | ||
987 | if (!name) | |
988 | return; | |
989 | sym = symbol_find_or_make (name); | |
38cf168b | 990 | if (S_IS_DEFINED (sym) || symbol_equated_p (sym)) |
ba8826a8 | 991 | { |
38cf168b | 992 | if (S_IS_VOLATILE (sym)) |
ba8826a8 | 993 | sym = symbol_clone (sym, 1); |
38cf168b AM |
994 | else if (!S_CAN_BE_REDEFINED (sym)) |
995 | { | |
996 | as_bad (_("symbol `%s' is already defined"), name); | |
997 | return; | |
998 | } | |
ba8826a8 | 999 | } |
38cf168b AM |
1000 | S_SET_SEGMENT (sym, undefined_section); |
1001 | S_SET_VALUE (sym, 0); | |
1002 | symbol_set_frag (sym, &zero_address_frag); | |
ba8826a8 AO |
1003 | } |
1004 | current.view = sym; | |
1005 | } | |
bd0eb99b RH |
1006 | else |
1007 | { | |
ecea7679 | 1008 | as_bad (_("unknown .loc sub-directive `%s'"), p); |
d02603dc | 1009 | (void) restore_line_pointer (c); |
bd0eb99b RH |
1010 | return; |
1011 | } | |
1012 | ||
d02603dc | 1013 | SKIP_WHITESPACE_AFTER_NAME (); |
bd0eb99b RH |
1014 | } |
1015 | ||
1016 | demand_empty_rest_of_line (); | |
1eee4adc | 1017 | dwarf2_loc_directive_seen = TRUE; |
7cadeb2c | 1018 | debug_type = DEBUG_NONE; |
ba8826a8 AO |
1019 | |
1020 | /* If we were given a view id, emit the row right away. */ | |
1021 | if (current.view) | |
1022 | dwarf2_emit_insn (0); | |
220e750f | 1023 | } |
07a53e5c RH |
1024 | |
1025 | void | |
1026 | dwarf2_directive_loc_mark_labels (int dummy ATTRIBUTE_UNUSED) | |
1027 | { | |
1028 | offsetT value = get_absolute_expression (); | |
1029 | ||
1030 | if (value != 0 && value != 1) | |
1031 | { | |
1032 | as_bad (_("expected 0 or 1")); | |
1033 | ignore_rest_of_line (); | |
1034 | } | |
1035 | else | |
1036 | { | |
1037 | dwarf2_loc_mark_labels = value != 0; | |
1038 | demand_empty_rest_of_line (); | |
1039 | } | |
1040 | } | |
220e750f RH |
1041 | \f |
1042 | static struct frag * | |
a2e22468 | 1043 | first_frag_for_seg (segT seg) |
220e750f | 1044 | { |
c9049d30 | 1045 | return seg_info (seg)->frchainP->frch_root; |
220e750f RH |
1046 | } |
1047 | ||
1048 | static struct frag * | |
a2e22468 | 1049 | last_frag_for_seg (segT seg) |
220e750f | 1050 | { |
c9049d30 | 1051 | frchainS *f = seg_info (seg)->frchainP; |
220e750f | 1052 | |
c9049d30 AM |
1053 | while (f->frch_next != NULL) |
1054 | f = f->frch_next; | |
220e750f | 1055 | |
c9049d30 | 1056 | return f->frch_last; |
220e750f RH |
1057 | } |
1058 | \f | |
1059 | /* Emit a single byte into the current segment. */ | |
1060 | ||
1061 | static inline void | |
a2e22468 | 1062 | out_byte (int byte) |
220e750f RH |
1063 | { |
1064 | FRAG_APPEND_1_CHAR (byte); | |
1065 | } | |
1066 | ||
1067 | /* Emit a statement program opcode into the current segment. */ | |
1068 | ||
1069 | static inline void | |
a2e22468 | 1070 | out_opcode (int opc) |
220e750f RH |
1071 | { |
1072 | out_byte (opc); | |
1073 | } | |
1074 | ||
1075 | /* Emit a two-byte word into the current segment. */ | |
1076 | ||
1077 | static inline void | |
a2e22468 | 1078 | out_two (int data) |
220e750f RH |
1079 | { |
1080 | md_number_to_chars (frag_more (2), data, 2); | |
1081 | } | |
1082 | ||
1083 | /* Emit a four byte word into the current segment. */ | |
1084 | ||
1085 | static inline void | |
a2e22468 | 1086 | out_four (int data) |
220e750f RH |
1087 | { |
1088 | md_number_to_chars (frag_more (4), data, 4); | |
1089 | } | |
1090 | ||
1091 | /* Emit an unsigned "little-endian base 128" number. */ | |
1092 | ||
fac0d250 | 1093 | static void |
a2e22468 | 1094 | out_uleb128 (addressT value) |
220e750f RH |
1095 | { |
1096 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
1097 | } | |
1098 | ||
92846e72 CC |
1099 | /* Emit a signed "little-endian base 128" number. */ |
1100 | ||
1101 | static void | |
1102 | out_leb128 (addressT value) | |
1103 | { | |
1104 | output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); | |
1105 | } | |
1106 | ||
220e750f RH |
1107 | /* Emit a tuple for .debug_abbrev. */ |
1108 | ||
1109 | static inline void | |
a2e22468 | 1110 | out_abbrev (int name, int form) |
fac0d250 | 1111 | { |
220e750f RH |
1112 | out_uleb128 (name); |
1113 | out_uleb128 (form); | |
1114 | } | |
fac0d250 | 1115 | |
220e750f | 1116 | /* Get the size of a fragment. */ |
fac0d250 | 1117 | |
220e750f | 1118 | static offsetT |
c9049d30 | 1119 | get_frag_fix (fragS *frag, segT seg) |
220e750f RH |
1120 | { |
1121 | frchainS *fr; | |
1122 | ||
1123 | if (frag->fr_next) | |
1124 | return frag->fr_fix; | |
1125 | ||
1126 | /* If a fragment is the last in the chain, special measures must be | |
1127 | taken to find its size before relaxation, since it may be pending | |
1128 | on some subsegment chain. */ | |
c9049d30 | 1129 | for (fr = seg_info (seg)->frchainP; fr; fr = fr->frch_next) |
220e750f | 1130 | if (fr->frch_last == frag) |
c5c0a210 | 1131 | return (char *) obstack_next_free (&fr->frch_obstack) - frag->fr_literal; |
220e750f RH |
1132 | |
1133 | abort (); | |
1134 | } | |
fac0d250 | 1135 | |
220e750f | 1136 | /* Set an absolute address (may result in a relocation entry). */ |
fac0d250 | 1137 | |
204f543c CE |
1138 | static void |
1139 | out_inc_line_addr (int line_delta, addressT addr_delta); | |
1140 | ||
220e750f | 1141 | static void |
07a53e5c | 1142 | out_set_addr (symbolS *sym) |
220e750f | 1143 | { |
91d6fa6a | 1144 | expressionS exp; |
204f543c | 1145 | addressT expr_addr, expr_addr_aligned; |
9e3af0e7 | 1146 | |
031e3350 | 1147 | memset (&exp, 0, sizeof exp); |
fac0d250 | 1148 | |
204f543c CE |
1149 | /* The expression at the bottom must be aligned to OCTETS_PER_BYTE. The |
1150 | statements after the for loop will contribute 3 more octets. */ | |
1151 | expr_addr = frag_now_fix_octets () + 3; | |
1152 | expr_addr_aligned = (expr_addr + OCTETS_PER_BYTE - 1) & -OCTETS_PER_BYTE; | |
1153 | for ( ; expr_addr != expr_addr_aligned; expr_addr++) | |
1154 | out_inc_line_addr (0, 0); /* NOP */ | |
1155 | ||
1156 | out_opcode (DW_LNS_extended_op); /* 1 octet */ | |
1157 | out_uleb128 (sizeof_address + 1); /* 1 octet */ | |
1158 | ||
1159 | out_opcode (DW_LNE_set_address); /* 1 octet */ | |
91d6fa6a NC |
1160 | exp.X_op = O_symbol; |
1161 | exp.X_add_symbol = sym; | |
1162 | exp.X_add_number = 0; | |
1163 | emit_expr (&exp, sizeof_address); | |
fac0d250 RH |
1164 | } |
1165 | ||
a2e22468 | 1166 | static void scale_addr_delta (addressT *); |
c8970b4b | 1167 | |
a3b75434 | 1168 | static void |
d7342424 | 1169 | scale_addr_delta (addressT *addr_delta) |
a3b75434 DD |
1170 | { |
1171 | static int printed_this = 0; | |
8fbf7334 | 1172 | if (DWARF2_LINE_MIN_INSN_LENGTH > 1) |
a3b75434 | 1173 | { |
8fbf7334 JL |
1174 | if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH != 0 && !printed_this) |
1175 | { | |
1176 | as_bad("unaligned opcodes detected in executable segment"); | |
1177 | printed_this = 1; | |
1178 | } | |
1179 | *addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
a3b75434 | 1180 | } |
a3b75434 | 1181 | } |
a3b75434 | 1182 | |
220e750f RH |
1183 | /* Encode a pair of line and address skips as efficiently as possible. |
1184 | Note that the line skip is signed, whereas the address skip is unsigned. | |
353e2c69 | 1185 | |
220e750f RH |
1186 | The following two routines *must* be kept in sync. This is |
1187 | enforced by making emit_inc_line_addr abort if we do not emit | |
1188 | exactly the expected number of bytes. */ | |
1189 | ||
1190 | static int | |
a2e22468 | 1191 | size_inc_line_addr (int line_delta, addressT addr_delta) |
fac0d250 | 1192 | { |
220e750f RH |
1193 | unsigned int tmp, opcode; |
1194 | int len = 0; | |
fac0d250 | 1195 | |
220e750f | 1196 | /* Scale the address delta by the minimum instruction length. */ |
a3b75434 | 1197 | scale_addr_delta (&addr_delta); |
220e750f RH |
1198 | |
1199 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. | |
1200 | We cannot use special opcodes here, since we want the end_sequence | |
1201 | to emit the matrix entry. */ | |
1202 | if (line_delta == INT_MAX) | |
fac0d250 | 1203 | { |
220e750f RH |
1204 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
1205 | len = 1; | |
62e6b7b3 | 1206 | else if (addr_delta) |
220e750f RH |
1207 | len = 1 + sizeof_leb128 (addr_delta, 0); |
1208 | return len + 3; | |
fac0d250 | 1209 | } |
fac0d250 | 1210 | |
220e750f RH |
1211 | /* Bias the line delta by the base. */ |
1212 | tmp = line_delta - DWARF2_LINE_BASE; | |
fac0d250 | 1213 | |
220e750f RH |
1214 | /* If the line increment is out of range of a special opcode, we |
1215 | must encode it with DW_LNS_advance_line. */ | |
1216 | if (tmp >= DWARF2_LINE_RANGE) | |
1217 | { | |
1218 | len = 1 + sizeof_leb128 (line_delta, 1); | |
1219 | line_delta = 0; | |
1220 | tmp = 0 - DWARF2_LINE_BASE; | |
1221 | } | |
fac0d250 | 1222 | |
220e750f RH |
1223 | /* Bias the opcode by the special opcode base. */ |
1224 | tmp += DWARF2_LINE_OPCODE_BASE; | |
353e2c69 | 1225 | |
220e750f RH |
1226 | /* Avoid overflow when addr_delta is large. */ |
1227 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
1228 | { | |
1229 | /* Try using a special opcode. */ | |
1230 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
1231 | if (opcode <= 255) | |
1232 | return len + 1; | |
1233 | ||
1234 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
1235 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
1236 | if (opcode <= 255) | |
1237 | return len + 2; | |
1238 | } | |
1239 | ||
1240 | /* Otherwise use DW_LNS_advance_pc. */ | |
1241 | len += 1 + sizeof_leb128 (addr_delta, 0); | |
1242 | ||
1243 | /* DW_LNS_copy or special opcode. */ | |
1244 | len += 1; | |
1245 | ||
1246 | return len; | |
1247 | } | |
fac0d250 | 1248 | |
220e750f | 1249 | static void |
a2e22468 | 1250 | emit_inc_line_addr (int line_delta, addressT addr_delta, char *p, int len) |
220e750f RH |
1251 | { |
1252 | unsigned int tmp, opcode; | |
1253 | int need_copy = 0; | |
1254 | char *end = p + len; | |
fac0d250 | 1255 | |
07a53e5c RH |
1256 | /* Line number sequences cannot go backward in addresses. This means |
1257 | we've incorrectly ordered the statements in the sequence. */ | |
9c2799c2 | 1258 | gas_assert ((offsetT) addr_delta >= 0); |
07a53e5c | 1259 | |
220e750f | 1260 | /* Scale the address delta by the minimum instruction length. */ |
a3b75434 DD |
1261 | scale_addr_delta (&addr_delta); |
1262 | ||
220e750f RH |
1263 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
1264 | We cannot use special opcodes here, since we want the end_sequence | |
1265 | to emit the matrix entry. */ | |
1266 | if (line_delta == INT_MAX) | |
fac0d250 | 1267 | { |
220e750f RH |
1268 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
1269 | *p++ = DW_LNS_const_add_pc; | |
62e6b7b3 | 1270 | else if (addr_delta) |
fac0d250 | 1271 | { |
220e750f RH |
1272 | *p++ = DW_LNS_advance_pc; |
1273 | p += output_leb128 (p, addr_delta, 0); | |
fac0d250 | 1274 | } |
220e750f RH |
1275 | |
1276 | *p++ = DW_LNS_extended_op; | |
1277 | *p++ = 1; | |
1278 | *p++ = DW_LNE_end_sequence; | |
1279 | goto done; | |
fac0d250 RH |
1280 | } |
1281 | ||
220e750f RH |
1282 | /* Bias the line delta by the base. */ |
1283 | tmp = line_delta - DWARF2_LINE_BASE; | |
1284 | ||
1285 | /* If the line increment is out of range of a special opcode, we | |
1286 | must encode it with DW_LNS_advance_line. */ | |
1287 | if (tmp >= DWARF2_LINE_RANGE) | |
fac0d250 | 1288 | { |
220e750f RH |
1289 | *p++ = DW_LNS_advance_line; |
1290 | p += output_leb128 (p, line_delta, 1); | |
fac0d250 | 1291 | |
220e750f RH |
1292 | line_delta = 0; |
1293 | tmp = 0 - DWARF2_LINE_BASE; | |
1294 | need_copy = 1; | |
1295 | } | |
fac0d250 | 1296 | |
bd0eb99b RH |
1297 | /* Prettier, I think, to use DW_LNS_copy instead of a "line +0, addr +0" |
1298 | special opcode. */ | |
1299 | if (line_delta == 0 && addr_delta == 0) | |
1300 | { | |
1301 | *p++ = DW_LNS_copy; | |
1302 | goto done; | |
1303 | } | |
1304 | ||
220e750f RH |
1305 | /* Bias the opcode by the special opcode base. */ |
1306 | tmp += DWARF2_LINE_OPCODE_BASE; | |
fac0d250 | 1307 | |
220e750f RH |
1308 | /* Avoid overflow when addr_delta is large. */ |
1309 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
fac0d250 | 1310 | { |
220e750f RH |
1311 | /* Try using a special opcode. */ |
1312 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
1313 | if (opcode <= 255) | |
1314 | { | |
1315 | *p++ = opcode; | |
1316 | goto done; | |
1317 | } | |
1318 | ||
1319 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
1320 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
1321 | if (opcode <= 255) | |
fac0d250 | 1322 | { |
220e750f RH |
1323 | *p++ = DW_LNS_const_add_pc; |
1324 | *p++ = opcode; | |
1325 | goto done; | |
fac0d250 RH |
1326 | } |
1327 | } | |
220e750f RH |
1328 | |
1329 | /* Otherwise use DW_LNS_advance_pc. */ | |
1330 | *p++ = DW_LNS_advance_pc; | |
1331 | p += output_leb128 (p, addr_delta, 0); | |
1332 | ||
1333 | if (need_copy) | |
1334 | *p++ = DW_LNS_copy; | |
fac0d250 | 1335 | else |
220e750f | 1336 | *p++ = tmp; |
fac0d250 | 1337 | |
220e750f | 1338 | done: |
9c2799c2 | 1339 | gas_assert (p == end); |
220e750f | 1340 | } |
a8316fe2 | 1341 | |
220e750f | 1342 | /* Handy routine to combine calls to the above two routines. */ |
e1c05f12 | 1343 | |
220e750f | 1344 | static void |
a2e22468 | 1345 | out_inc_line_addr (int line_delta, addressT addr_delta) |
220e750f RH |
1346 | { |
1347 | int len = size_inc_line_addr (line_delta, addr_delta); | |
1348 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); | |
1349 | } | |
9de8d8f1 | 1350 | |
1737851b BW |
1351 | /* Write out an alternative form of line and address skips using |
1352 | DW_LNS_fixed_advance_pc opcodes. This uses more space than the default | |
7ddd14de BW |
1353 | line and address information, but it is required if linker relaxation |
1354 | could change the code offsets. The following two routines *must* be | |
1355 | kept in sync. */ | |
453dc3f0 | 1356 | #define ADDR_DELTA_LIMIT 50000 |
1737851b | 1357 | |
7ddd14de BW |
1358 | static int |
1359 | size_fixed_inc_line_addr (int line_delta, addressT addr_delta) | |
1737851b | 1360 | { |
7ddd14de | 1361 | int len = 0; |
1737851b BW |
1362 | |
1363 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */ | |
7ddd14de BW |
1364 | if (line_delta != INT_MAX) |
1365 | len = 1 + sizeof_leb128 (line_delta, 1); | |
1366 | ||
453dc3f0 | 1367 | if (addr_delta > ADDR_DELTA_LIMIT) |
7ddd14de BW |
1368 | { |
1369 | /* DW_LNS_extended_op */ | |
1370 | len += 1 + sizeof_leb128 (sizeof_address + 1, 0); | |
1371 | /* DW_LNE_set_address */ | |
1372 | len += 1 + sizeof_address; | |
1373 | } | |
1374 | else | |
1375 | /* DW_LNS_fixed_advance_pc */ | |
1376 | len += 3; | |
1377 | ||
1737851b | 1378 | if (line_delta == INT_MAX) |
7ddd14de BW |
1379 | /* DW_LNS_extended_op + DW_LNE_end_sequence */ |
1380 | len += 3; | |
1381 | else | |
1382 | /* DW_LNS_copy */ | |
1383 | len += 1; | |
1384 | ||
1385 | return len; | |
1386 | } | |
1387 | ||
1388 | static void | |
1389 | emit_fixed_inc_line_addr (int line_delta, addressT addr_delta, fragS *frag, | |
1390 | char *p, int len) | |
1391 | { | |
91d6fa6a | 1392 | expressionS *pexp; |
7ddd14de BW |
1393 | char *end = p + len; |
1394 | ||
1395 | /* Line number sequences cannot go backward in addresses. This means | |
1396 | we've incorrectly ordered the statements in the sequence. */ | |
9c2799c2 | 1397 | gas_assert ((offsetT) addr_delta >= 0); |
7ddd14de | 1398 | |
b40bf0a2 NC |
1399 | /* Verify that we have kept in sync with size_fixed_inc_line_addr. */ |
1400 | gas_assert (len == size_fixed_inc_line_addr (line_delta, addr_delta)); | |
1401 | ||
7ddd14de BW |
1402 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */ |
1403 | if (line_delta != INT_MAX) | |
1404 | { | |
1405 | *p++ = DW_LNS_advance_line; | |
1406 | p += output_leb128 (p, line_delta, 1); | |
1407 | } | |
1408 | ||
91d6fa6a | 1409 | pexp = symbol_get_value_expression (frag->fr_symbol); |
7ddd14de BW |
1410 | |
1411 | /* The DW_LNS_fixed_advance_pc opcode has a 2-byte operand so it can | |
1412 | advance the address by at most 64K. Linker relaxation (without | |
1413 | which this function would not be used) could change the operand by | |
1414 | an unknown amount. If the address increment is getting close to | |
1415 | the limit, just reset the address. */ | |
453dc3f0 | 1416 | if (addr_delta > ADDR_DELTA_LIMIT) |
1737851b | 1417 | { |
7ddd14de | 1418 | symbolS *to_sym; |
91d6fa6a | 1419 | expressionS exp; |
7ddd14de | 1420 | |
031e3350 | 1421 | memset (&exp, 0, sizeof exp); |
9f6db0d3 | 1422 | gas_assert (pexp->X_op == O_subtract); |
91d6fa6a | 1423 | to_sym = pexp->X_add_symbol; |
7ddd14de BW |
1424 | |
1425 | *p++ = DW_LNS_extended_op; | |
1426 | p += output_leb128 (p, sizeof_address + 1, 0); | |
1427 | *p++ = DW_LNE_set_address; | |
91d6fa6a NC |
1428 | exp.X_op = O_symbol; |
1429 | exp.X_add_symbol = to_sym; | |
1430 | exp.X_add_number = 0; | |
62ebcb5c | 1431 | emit_expr_fix (&exp, sizeof_address, frag, p, TC_PARSE_CONS_RETURN_NONE); |
7ddd14de BW |
1432 | p += sizeof_address; |
1433 | } | |
1434 | else | |
1435 | { | |
1436 | *p++ = DW_LNS_fixed_advance_pc; | |
62ebcb5c | 1437 | emit_expr_fix (pexp, 2, frag, p, TC_PARSE_CONS_RETURN_NONE); |
7ddd14de | 1438 | p += 2; |
1737851b BW |
1439 | } |
1440 | ||
7ddd14de BW |
1441 | if (line_delta == INT_MAX) |
1442 | { | |
1443 | *p++ = DW_LNS_extended_op; | |
1444 | *p++ = 1; | |
1445 | *p++ = DW_LNE_end_sequence; | |
1446 | } | |
1447 | else | |
1448 | *p++ = DW_LNS_copy; | |
1737851b | 1449 | |
9c2799c2 | 1450 | gas_assert (p == end); |
1737851b BW |
1451 | } |
1452 | ||
220e750f RH |
1453 | /* Generate a variant frag that we can use to relax address/line |
1454 | increments between fragments of the target segment. */ | |
9e3af0e7 | 1455 | |
220e750f | 1456 | static void |
07a53e5c | 1457 | relax_inc_line_addr (int line_delta, symbolS *to_sym, symbolS *from_sym) |
220e750f | 1458 | { |
91d6fa6a | 1459 | expressionS exp; |
220e750f | 1460 | int max_chars; |
6576f0b5 | 1461 | |
031e3350 | 1462 | memset (&exp, 0, sizeof exp); |
91d6fa6a NC |
1463 | exp.X_op = O_subtract; |
1464 | exp.X_add_symbol = to_sym; | |
1465 | exp.X_op_symbol = from_sym; | |
1466 | exp.X_add_number = 0; | |
fac0d250 | 1467 | |
220e750f RH |
1468 | /* The maximum size of the frag is the line delta with a maximum |
1469 | sized address delta. */ | |
7ddd14de BW |
1470 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1471 | max_chars = size_fixed_inc_line_addr (line_delta, | |
1472 | -DWARF2_LINE_MIN_INSN_LENGTH); | |
1473 | else | |
1474 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); | |
fac0d250 | 1475 | |
220e750f | 1476 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
91d6fa6a | 1477 | make_expr_symbol (&exp), line_delta, NULL); |
220e750f | 1478 | } |
fac0d250 | 1479 | |
220e750f RH |
1480 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
1481 | based on the current values of the symbols. It is called before | |
1482 | the relaxation loop. We set fr_subtype to the expected length. */ | |
fac0d250 | 1483 | |
220e750f | 1484 | int |
a2e22468 | 1485 | dwarf2dbg_estimate_size_before_relax (fragS *frag) |
220e750f RH |
1486 | { |
1487 | offsetT addr_delta; | |
1488 | int size; | |
fac0d250 | 1489 | |
6386f3a7 | 1490 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
7ddd14de BW |
1491 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1492 | size = size_fixed_inc_line_addr (frag->fr_offset, addr_delta); | |
1493 | else | |
1494 | size = size_inc_line_addr (frag->fr_offset, addr_delta); | |
fac0d250 | 1495 | |
220e750f | 1496 | frag->fr_subtype = size; |
fac0d250 | 1497 | |
220e750f RH |
1498 | return size; |
1499 | } | |
1500 | ||
1501 | /* This function relaxes a rs_dwarf2dbg variant frag based on the | |
1502 | current values of the symbols. fr_subtype is the current length | |
1503 | of the frag. This returns the change in frag length. */ | |
1504 | ||
1505 | int | |
a2e22468 | 1506 | dwarf2dbg_relax_frag (fragS *frag) |
220e750f RH |
1507 | { |
1508 | int old_size, new_size; | |
fac0d250 | 1509 | |
220e750f RH |
1510 | old_size = frag->fr_subtype; |
1511 | new_size = dwarf2dbg_estimate_size_before_relax (frag); | |
ee515fb7 | 1512 | |
220e750f | 1513 | return new_size - old_size; |
fac0d250 RH |
1514 | } |
1515 | ||
220e750f RH |
1516 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
1517 | fill frag. This is called after all relaxation has been done. | |
1518 | fr_subtype will be the desired length of the frag. */ | |
1519 | ||
1520 | void | |
a2e22468 | 1521 | dwarf2dbg_convert_frag (fragS *frag) |
fac0d250 | 1522 | { |
220e750f RH |
1523 | offsetT addr_diff; |
1524 | ||
453dc3f0 NC |
1525 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1526 | { | |
2b0f3761 | 1527 | /* If linker relaxation is enabled then the distance between the two |
453dc3f0 NC |
1528 | symbols in the frag->fr_symbol expression might change. Hence we |
1529 | cannot rely upon the value computed by resolve_symbol_value. | |
1530 | Instead we leave the expression unfinalized and allow | |
1531 | emit_fixed_inc_line_addr to create a fixup (which later becomes a | |
1532 | relocation) that will allow the linker to correctly compute the | |
1533 | actual address difference. We have to use a fixed line advance for | |
1534 | this as we cannot (easily) relocate leb128 encoded values. */ | |
1535 | int saved_finalize_syms = finalize_syms; | |
1536 | ||
1537 | finalize_syms = 0; | |
1538 | addr_diff = resolve_symbol_value (frag->fr_symbol); | |
1539 | finalize_syms = saved_finalize_syms; | |
1540 | } | |
1541 | else | |
1542 | addr_diff = resolve_symbol_value (frag->fr_symbol); | |
fac0d250 | 1543 | |
220e750f RH |
1544 | /* fr_var carries the max_chars that we created the fragment with. |
1545 | fr_subtype carries the current expected length. We must, of | |
1546 | course, have allocated enough memory earlier. */ | |
9c2799c2 | 1547 | gas_assert (frag->fr_var >= (int) frag->fr_subtype); |
fac0d250 | 1548 | |
7ddd14de BW |
1549 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1550 | emit_fixed_inc_line_addr (frag->fr_offset, addr_diff, frag, | |
1551 | frag->fr_literal + frag->fr_fix, | |
1552 | frag->fr_subtype); | |
1553 | else | |
1554 | emit_inc_line_addr (frag->fr_offset, addr_diff, | |
1555 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); | |
220e750f RH |
1556 | |
1557 | frag->fr_fix += frag->fr_subtype; | |
1558 | frag->fr_type = rs_fill; | |
1559 | frag->fr_var = 0; | |
1560 | frag->fr_offset = 0; | |
1561 | } | |
1562 | ||
1563 | /* Generate .debug_line content for the chain of line number entries | |
1564 | beginning at E, for segment SEG. */ | |
1565 | ||
1566 | static void | |
a2e22468 | 1567 | process_entries (segT seg, struct line_entry *e) |
220e750f RH |
1568 | { |
1569 | unsigned filenum = 1; | |
1570 | unsigned line = 1; | |
1571 | unsigned column = 0; | |
bd0eb99b RH |
1572 | unsigned isa = 0; |
1573 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0; | |
07a53e5c RH |
1574 | fragS *last_frag = NULL, *frag; |
1575 | addressT last_frag_ofs = 0, frag_ofs; | |
fead5cd9 | 1576 | symbolS *last_lab = NULL, *lab; |
220e750f RH |
1577 | struct line_entry *next; |
1578 | ||
b40bf0a2 NC |
1579 | if (flag_dwarf_sections) |
1580 | { | |
1581 | char * name; | |
1582 | const char * sec_name; | |
1583 | ||
2b0f3761 | 1584 | /* Switch to the relevant sub-section before we start to emit |
b40bf0a2 NC |
1585 | the line number table. |
1586 | ||
1587 | FIXME: These sub-sections do not have a normal Line Number | |
1588 | Program Header, thus strictly speaking they are not valid | |
1589 | DWARF sections. Unfortunately the DWARF standard assumes | |
1590 | a one-to-one relationship between compilation units and | |
1591 | line number tables. Thus we have to have a .debug_line | |
1592 | section, as well as our sub-sections, and we have to ensure | |
1593 | that all of the sub-sections are merged into a proper | |
1594 | .debug_line section before a debugger sees them. */ | |
3739860c | 1595 | |
b40bf0a2 NC |
1596 | sec_name = bfd_get_section_name (stdoutput, seg); |
1597 | if (strcmp (sec_name, ".text") != 0) | |
1598 | { | |
29a2809e | 1599 | name = concat (".debug_line", sec_name, (char *) NULL); |
b40bf0a2 NC |
1600 | subseg_set (subseg_get (name, FALSE), 0); |
1601 | } | |
1602 | else | |
1603 | /* Don't create a .debug_line.text section - | |
1604 | that is redundant. Instead just switch back to the | |
1605 | normal .debug_line section. */ | |
1606 | subseg_set (subseg_get (".debug_line", FALSE), 0); | |
1607 | } | |
1608 | ||
fead5cd9 | 1609 | do |
fac0d250 | 1610 | { |
07a53e5c | 1611 | int line_delta; |
220e750f RH |
1612 | |
1613 | if (filenum != e->loc.filenum) | |
fac0d250 | 1614 | { |
220e750f RH |
1615 | filenum = e->loc.filenum; |
1616 | out_opcode (DW_LNS_set_file); | |
1617 | out_uleb128 (filenum); | |
220e750f RH |
1618 | } |
1619 | ||
1620 | if (column != e->loc.column) | |
1621 | { | |
1622 | column = e->loc.column; | |
1623 | out_opcode (DW_LNS_set_column); | |
1624 | out_uleb128 (column); | |
220e750f RH |
1625 | } |
1626 | ||
92846e72 CC |
1627 | if (e->loc.discriminator != 0) |
1628 | { | |
1629 | out_opcode (DW_LNS_extended_op); | |
1630 | out_leb128 (1 + sizeof_leb128 (e->loc.discriminator, 0)); | |
1631 | out_opcode (DW_LNE_set_discriminator); | |
1632 | out_uleb128 (e->loc.discriminator); | |
1633 | } | |
1634 | ||
bd0eb99b RH |
1635 | if (isa != e->loc.isa) |
1636 | { | |
1637 | isa = e->loc.isa; | |
1638 | out_opcode (DW_LNS_set_isa); | |
1639 | out_uleb128 (isa); | |
bd0eb99b RH |
1640 | } |
1641 | ||
1642 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_IS_STMT) | |
220e750f RH |
1643 | { |
1644 | flags = e->loc.flags; | |
1645 | out_opcode (DW_LNS_negate_stmt); | |
220e750f RH |
1646 | } |
1647 | ||
bd0eb99b | 1648 | if (e->loc.flags & DWARF2_FLAG_BASIC_BLOCK) |
07a53e5c | 1649 | out_opcode (DW_LNS_set_basic_block); |
220e750f | 1650 | |
bd0eb99b | 1651 | if (e->loc.flags & DWARF2_FLAG_PROLOGUE_END) |
07a53e5c | 1652 | out_opcode (DW_LNS_set_prologue_end); |
bd0eb99b RH |
1653 | |
1654 | if (e->loc.flags & DWARF2_FLAG_EPILOGUE_BEGIN) | |
07a53e5c | 1655 | out_opcode (DW_LNS_set_epilogue_begin); |
bd0eb99b | 1656 | |
fb81275c JM |
1657 | /* Don't try to optimize away redundant entries; gdb wants two |
1658 | entries for a function where the code starts on the same line as | |
1659 | the {, and there's no way to identify that case here. Trust gcc | |
1660 | to optimize appropriately. */ | |
07a53e5c RH |
1661 | line_delta = e->loc.line - line; |
1662 | lab = e->label; | |
1663 | frag = symbol_get_frag (lab); | |
1664 | frag_ofs = S_GET_VALUE (lab); | |
220e750f | 1665 | |
ba8826a8 AO |
1666 | if (last_frag == NULL |
1667 | || (e->loc.view == force_reset_view && force_reset_view | |
1668 | /* If we're going to reset the view, but we know we're | |
1669 | advancing the PC, we don't have to force with | |
1670 | set_address. We know we do when we're at the same | |
1671 | address of the same frag, and we know we might when | |
1672 | we're in the beginning of a frag, and we were at the | |
1673 | end of the previous frag. */ | |
1674 | && (frag == last_frag | |
1675 | ? (last_frag_ofs == frag_ofs) | |
1676 | : (frag_ofs == 0 | |
1677 | && ((offsetT)last_frag_ofs | |
1678 | >= get_frag_fix (last_frag, seg)))))) | |
220e750f | 1679 | { |
07a53e5c RH |
1680 | out_set_addr (lab); |
1681 | out_inc_line_addr (line_delta, 0); | |
220e750f | 1682 | } |
7ddd14de | 1683 | else if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) |
07a53e5c RH |
1684 | out_inc_line_addr (line_delta, frag_ofs - last_frag_ofs); |
1685 | else | |
1686 | relax_inc_line_addr (line_delta, lab, last_lab); | |
1687 | ||
1688 | line = e->loc.line; | |
1689 | last_lab = lab; | |
1690 | last_frag = frag; | |
1691 | last_frag_ofs = frag_ofs; | |
220e750f RH |
1692 | |
1693 | next = e->next; | |
1694 | free (e); | |
1695 | e = next; | |
fac0d250 | 1696 | } |
fead5cd9 | 1697 | while (e); |
353e2c69 | 1698 | |
220e750f | 1699 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
07a53e5c | 1700 | frag = last_frag_for_seg (seg); |
c9049d30 | 1701 | frag_ofs = get_frag_fix (frag, seg); |
7ddd14de | 1702 | if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) |
07a53e5c | 1703 | out_inc_line_addr (INT_MAX, frag_ofs - last_frag_ofs); |
220e750f | 1704 | else |
07a53e5c RH |
1705 | { |
1706 | lab = symbol_temp_new (seg, frag_ofs, frag); | |
1707 | relax_inc_line_addr (INT_MAX, lab, last_lab); | |
1708 | } | |
fac0d250 RH |
1709 | } |
1710 | ||
220e750f RH |
1711 | /* Emit the directory and file tables for .debug_line. */ |
1712 | ||
fac0d250 | 1713 | static void |
a2e22468 | 1714 | out_file_list (void) |
fac0d250 RH |
1715 | { |
1716 | size_t size; | |
3d6b762c | 1717 | const char *dir; |
fac0d250 | 1718 | char *cp; |
220e750f RH |
1719 | unsigned int i; |
1720 | ||
a7ed1ca2 NC |
1721 | /* Emit directory list. */ |
1722 | for (i = 1; i < dirs_in_use; ++i) | |
1723 | { | |
3d6b762c JM |
1724 | dir = remap_debug_filename (dirs[i]); |
1725 | size = strlen (dir) + 1; | |
a7ed1ca2 | 1726 | cp = frag_more (size); |
3d6b762c | 1727 | memcpy (cp, dir, size); |
a7ed1ca2 NC |
1728 | } |
1729 | /* Terminate it. */ | |
220e750f | 1730 | out_byte ('\0'); |
fac0d250 | 1731 | |
220e750f | 1732 | for (i = 1; i < files_in_use; ++i) |
fac0d250 | 1733 | { |
01e1a5bc NC |
1734 | const char *fullfilename; |
1735 | ||
249e3833 RH |
1736 | if (files[i].filename == NULL) |
1737 | { | |
0e389e77 | 1738 | as_bad (_("unassigned file number %ld"), (long) i); |
88b4ca40 RH |
1739 | /* Prevent a crash later, particularly for file 1. */ |
1740 | files[i].filename = ""; | |
249e3833 RH |
1741 | continue; |
1742 | } | |
1743 | ||
01e1a5bc NC |
1744 | fullfilename = DWARF2_FILE_NAME (files[i].filename, |
1745 | files[i].dir ? dirs [files [i].dir] : ""); | |
1746 | size = strlen (fullfilename) + 1; | |
fac0d250 | 1747 | cp = frag_more (size); |
01e1a5bc | 1748 | memcpy (cp, fullfilename, size); |
fac0d250 | 1749 | |
220e750f | 1750 | out_uleb128 (files[i].dir); /* directory number */ |
01e1a5bc NC |
1751 | /* Output the last modification timestamp. */ |
1752 | out_uleb128 (DWARF2_FILE_TIME_NAME (files[i].filename, | |
1753 | files[i].dir ? dirs [files [i].dir] : "")); | |
1754 | /* Output the filesize. */ | |
1755 | out_uleb128 (DWARF2_FILE_SIZE_NAME (files[i].filename, | |
1756 | files[i].dir ? dirs [files [i].dir] : "")); | |
fac0d250 | 1757 | } |
353e2c69 KH |
1758 | |
1759 | /* Terminate filename list. */ | |
1760 | out_byte (0); | |
fac0d250 RH |
1761 | } |
1762 | ||
413a266c AM |
1763 | /* Switch to SEC and output a header length field. Return the size of |
1764 | offsets used in SEC. The caller must set EXPR->X_add_symbol value | |
d025d5e5 MW |
1765 | to the end of the section. EXPR->X_add_number will be set to the |
1766 | negative size of the header. */ | |
413a266c AM |
1767 | |
1768 | static int | |
91d6fa6a | 1769 | out_header (asection *sec, expressionS *exp) |
413a266c AM |
1770 | { |
1771 | symbolS *start_sym; | |
1772 | symbolS *end_sym; | |
1773 | ||
1774 | subseg_set (sec, 0); | |
b57dc16f | 1775 | |
0f8f0c57 NC |
1776 | if (flag_dwarf_sections) |
1777 | { | |
1778 | /* If we are going to put the start and end symbols in different | |
1779 | sections, then we need real symbols, not just fake, local ones. */ | |
1780 | frag_now_fix (); | |
1781 | start_sym = symbol_make (".Ldebug_line_start"); | |
1782 | end_sym = symbol_make (".Ldebug_line_end"); | |
1783 | symbol_set_value_now (start_sym); | |
1784 | } | |
1785 | else | |
0f8f0c57 | 1786 | { |
72354279 | 1787 | start_sym = symbol_temp_new_now_octets (); |
0f8f0c57 NC |
1788 | end_sym = symbol_temp_make (); |
1789 | } | |
413a266c AM |
1790 | |
1791 | /* Total length of the information. */ | |
91d6fa6a NC |
1792 | exp->X_op = O_subtract; |
1793 | exp->X_add_symbol = end_sym; | |
1794 | exp->X_op_symbol = start_sym; | |
413a266c AM |
1795 | |
1796 | switch (DWARF2_FORMAT (sec)) | |
1797 | { | |
1798 | case dwarf2_format_32bit: | |
91d6fa6a NC |
1799 | exp->X_add_number = -4; |
1800 | emit_expr (exp, 4); | |
413a266c AM |
1801 | return 4; |
1802 | ||
1803 | case dwarf2_format_64bit: | |
91d6fa6a | 1804 | exp->X_add_number = -12; |
413a266c | 1805 | out_four (-1); |
91d6fa6a | 1806 | emit_expr (exp, 8); |
413a266c AM |
1807 | return 8; |
1808 | ||
1809 | case dwarf2_format_64bit_irix: | |
91d6fa6a NC |
1810 | exp->X_add_number = -8; |
1811 | emit_expr (exp, 8); | |
413a266c AM |
1812 | return 8; |
1813 | } | |
1814 | ||
1815 | as_fatal (_("internal error: unknown dwarf2 format")); | |
1816 | return 0; | |
1817 | } | |
1818 | ||
220e750f RH |
1819 | /* Emit the collected .debug_line data. */ |
1820 | ||
1821 | static void | |
a2e22468 | 1822 | out_debug_line (segT line_seg) |
220e750f | 1823 | { |
91d6fa6a | 1824 | expressionS exp; |
02fe846e | 1825 | symbolS *prologue_start, *prologue_end; |
220e750f RH |
1826 | symbolS *line_end; |
1827 | struct line_seg *s; | |
14e777e0 | 1828 | int sizeof_offset; |
145c4477 | 1829 | addressT section_end, section_end_aligned; |
220e750f | 1830 | |
031e3350 | 1831 | memset (&exp, 0, sizeof exp); |
91d6fa6a NC |
1832 | sizeof_offset = out_header (line_seg, &exp); |
1833 | line_end = exp.X_add_symbol; | |
220e750f RH |
1834 | |
1835 | /* Version. */ | |
88ebb0a1 | 1836 | out_two (DWARF2_LINE_VERSION); |
220e750f RH |
1837 | |
1838 | /* Length of the prologue following this length. */ | |
02fe846e | 1839 | prologue_start = symbol_temp_make (); |
413a266c | 1840 | prologue_end = symbol_temp_make (); |
02fe846e | 1841 | exp.X_op = O_subtract; |
91d6fa6a | 1842 | exp.X_add_symbol = prologue_end; |
02fe846e AM |
1843 | exp.X_op_symbol = prologue_start; |
1844 | exp.X_add_number = 0; | |
91d6fa6a | 1845 | emit_expr (&exp, sizeof_offset); |
38c24f42 | 1846 | symbol_set_value_now_octets (prologue_start); |
220e750f RH |
1847 | |
1848 | /* Parameters of the state machine. */ | |
1849 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); | |
1850 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); | |
1851 | out_byte (DWARF2_LINE_BASE); | |
1852 | out_byte (DWARF2_LINE_RANGE); | |
1853 | out_byte (DWARF2_LINE_OPCODE_BASE); | |
1854 | ||
1855 | /* Standard opcode lengths. */ | |
1856 | out_byte (0); /* DW_LNS_copy */ | |
1857 | out_byte (1); /* DW_LNS_advance_pc */ | |
1858 | out_byte (1); /* DW_LNS_advance_line */ | |
1859 | out_byte (1); /* DW_LNS_set_file */ | |
1860 | out_byte (1); /* DW_LNS_set_column */ | |
1861 | out_byte (0); /* DW_LNS_negate_stmt */ | |
1862 | out_byte (0); /* DW_LNS_set_basic_block */ | |
1863 | out_byte (0); /* DW_LNS_const_add_pc */ | |
1864 | out_byte (1); /* DW_LNS_fixed_advance_pc */ | |
bd0eb99b RH |
1865 | out_byte (0); /* DW_LNS_set_prologue_end */ |
1866 | out_byte (0); /* DW_LNS_set_epilogue_begin */ | |
1867 | out_byte (1); /* DW_LNS_set_isa */ | |
220e750f RH |
1868 | |
1869 | out_file_list (); | |
1870 | ||
38c24f42 | 1871 | symbol_set_value_now_octets (prologue_end); |
220e750f RH |
1872 | |
1873 | /* For each section, emit a statement program. */ | |
ee515fb7 | 1874 | for (s = all_segs; s; s = s->next) |
9aec2026 NC |
1875 | if (SEG_NORMAL (s->seg)) |
1876 | process_entries (s->seg, s->head->head); | |
1877 | else | |
1878 | as_warn ("dwarf line number information for %s ignored", | |
1879 | segment_name (s->seg)); | |
220e750f | 1880 | |
b40bf0a2 NC |
1881 | if (flag_dwarf_sections) |
1882 | /* We have to switch to the special .debug_line_end section | |
1883 | before emitting the end-of-debug_line symbol. The linker | |
1884 | script arranges for this section to be placed after all the | |
1885 | (potentially garbage collected) .debug_line.<foo> sections. | |
1886 | This section contains the line_end symbol which is used to | |
1887 | compute the size of the linked .debug_line section, as seen | |
1888 | in the DWARF Line Number header. */ | |
1889 | subseg_set (subseg_get (".debug_line_end", FALSE), 0); | |
1890 | ||
145c4477 CE |
1891 | /* Pad size of .debug_line section to a multiple of OCTETS_PER_BYTE. |
1892 | Simply sizing the section in md_section_align() is not sufficient, | |
1893 | also the size field in the .debug_line header must be a multiple | |
1894 | of OCTETS_PER_BYTE. Not doing so will introduce gaps within the | |
1895 | .debug_line sections after linking. */ | |
1896 | section_end = frag_now_fix_octets (); | |
1897 | section_end_aligned = (section_end + OCTETS_PER_BYTE - 1) & -OCTETS_PER_BYTE; | |
1898 | for ( ; section_end != section_end_aligned; section_end++) | |
1899 | out_inc_line_addr (0, 0); /* NOP */ | |
1900 | ||
72354279 | 1901 | symbol_set_value_now_octets (line_end); |
220e750f RH |
1902 | } |
1903 | ||
802f5d9e NC |
1904 | static void |
1905 | out_debug_ranges (segT ranges_seg) | |
1906 | { | |
1907 | unsigned int addr_size = sizeof_address; | |
1908 | struct line_seg *s; | |
91d6fa6a | 1909 | expressionS exp; |
802f5d9e NC |
1910 | unsigned int i; |
1911 | ||
031e3350 | 1912 | memset (&exp, 0, sizeof exp); |
802f5d9e NC |
1913 | subseg_set (ranges_seg, 0); |
1914 | ||
1915 | /* Base Address Entry. */ | |
7fd3924a | 1916 | for (i = 0; i < addr_size; i++) |
802f5d9e | 1917 | out_byte (0xff); |
7fd3924a | 1918 | for (i = 0; i < addr_size; i++) |
802f5d9e NC |
1919 | out_byte (0); |
1920 | ||
1921 | /* Range List Entry. */ | |
1922 | for (s = all_segs; s; s = s->next) | |
1923 | { | |
1924 | fragS *frag; | |
1925 | symbolS *beg, *end; | |
1926 | ||
1927 | frag = first_frag_for_seg (s->seg); | |
1928 | beg = symbol_temp_new (s->seg, 0, frag); | |
1929 | s->text_start = beg; | |
1930 | ||
1931 | frag = last_frag_for_seg (s->seg); | |
1932 | end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); | |
1933 | s->text_end = end; | |
1934 | ||
91d6fa6a NC |
1935 | exp.X_op = O_symbol; |
1936 | exp.X_add_symbol = beg; | |
1937 | exp.X_add_number = 0; | |
1938 | emit_expr (&exp, addr_size); | |
802f5d9e | 1939 | |
91d6fa6a NC |
1940 | exp.X_op = O_symbol; |
1941 | exp.X_add_symbol = end; | |
1942 | exp.X_add_number = 0; | |
1943 | emit_expr (&exp, addr_size); | |
802f5d9e NC |
1944 | } |
1945 | ||
1946 | /* End of Range Entry. */ | |
7fd3924a | 1947 | for (i = 0; i < addr_size; i++) |
802f5d9e | 1948 | out_byte (0); |
7fd3924a | 1949 | for (i = 0; i < addr_size; i++) |
802f5d9e NC |
1950 | out_byte (0); |
1951 | } | |
1952 | ||
220e750f RH |
1953 | /* Emit data for .debug_aranges. */ |
1954 | ||
58b5739a | 1955 | static void |
a2e22468 | 1956 | out_debug_aranges (segT aranges_seg, segT info_seg) |
fac0d250 | 1957 | { |
220e750f | 1958 | unsigned int addr_size = sizeof_address; |
d025d5e5 | 1959 | offsetT size; |
220e750f | 1960 | struct line_seg *s; |
91d6fa6a | 1961 | expressionS exp; |
413a266c | 1962 | symbolS *aranges_end; |
220e750f | 1963 | char *p; |
413a266c | 1964 | int sizeof_offset; |
fac0d250 | 1965 | |
031e3350 | 1966 | memset (&exp, 0, sizeof exp); |
91d6fa6a NC |
1967 | sizeof_offset = out_header (aranges_seg, &exp); |
1968 | aranges_end = exp.X_add_symbol; | |
d025d5e5 | 1969 | size = -exp.X_add_number; |
fac0d250 | 1970 | |
220e750f | 1971 | /* Version. */ |
88ebb0a1 | 1972 | out_two (DWARF2_ARANGES_VERSION); |
d025d5e5 | 1973 | size += 2; |
4dc7ead9 | 1974 | |
220e750f | 1975 | /* Offset to .debug_info. */ |
413a266c | 1976 | TC_DWARF2_EMIT_OFFSET (section_symbol (info_seg), sizeof_offset); |
d025d5e5 | 1977 | size += sizeof_offset; |
220e750f RH |
1978 | |
1979 | /* Size of an address (offset portion). */ | |
1980 | out_byte (addr_size); | |
d025d5e5 | 1981 | size++; |
220e750f RH |
1982 | |
1983 | /* Size of a segment descriptor. */ | |
1984 | out_byte (0); | |
d025d5e5 | 1985 | size++; |
220e750f RH |
1986 | |
1987 | /* Align the header. */ | |
d025d5e5 MW |
1988 | while ((size++ % (2 * addr_size)) > 0) |
1989 | out_byte (0); | |
4dc7ead9 | 1990 | |
ee515fb7 | 1991 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1992 | { |
1993 | fragS *frag; | |
1994 | symbolS *beg, *end; | |
1995 | ||
1996 | frag = first_frag_for_seg (s->seg); | |
b7d6ed97 | 1997 | beg = symbol_temp_new (s->seg, 0, frag); |
220e750f RH |
1998 | s->text_start = beg; |
1999 | ||
2000 | frag = last_frag_for_seg (s->seg); | |
c9049d30 | 2001 | end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); |
220e750f RH |
2002 | s->text_end = end; |
2003 | ||
91d6fa6a NC |
2004 | exp.X_op = O_symbol; |
2005 | exp.X_add_symbol = beg; | |
2006 | exp.X_add_number = 0; | |
2007 | emit_expr (&exp, addr_size); | |
220e750f | 2008 | |
91d6fa6a NC |
2009 | exp.X_op = O_subtract; |
2010 | exp.X_add_symbol = end; | |
2011 | exp.X_op_symbol = beg; | |
2012 | exp.X_add_number = 0; | |
2013 | emit_expr (&exp, addr_size); | |
220e750f | 2014 | } |
4dc7ead9 | 2015 | |
220e750f RH |
2016 | p = frag_more (2 * addr_size); |
2017 | md_number_to_chars (p, 0, addr_size); | |
2018 | md_number_to_chars (p + addr_size, 0, addr_size); | |
413a266c | 2019 | |
72354279 | 2020 | symbol_set_value_now_octets (aranges_end); |
4dc7ead9 RH |
2021 | } |
2022 | ||
220e750f RH |
2023 | /* Emit data for .debug_abbrev. Note that this must be kept in |
2024 | sync with out_debug_info below. */ | |
fac0d250 | 2025 | |
220e750f | 2026 | static void |
413a266c AM |
2027 | out_debug_abbrev (segT abbrev_seg, |
2028 | segT info_seg ATTRIBUTE_UNUSED, | |
2029 | segT line_seg ATTRIBUTE_UNUSED) | |
220e750f RH |
2030 | { |
2031 | subseg_set (abbrev_seg, 0); | |
fac0d250 | 2032 | |
220e750f RH |
2033 | out_uleb128 (1); |
2034 | out_uleb128 (DW_TAG_compile_unit); | |
2035 | out_byte (DW_CHILDREN_no); | |
413a266c AM |
2036 | if (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit) |
2037 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); | |
2038 | else | |
2039 | out_abbrev (DW_AT_stmt_list, DW_FORM_data8); | |
220e750f | 2040 | if (all_segs->next == NULL) |
4dc7ead9 | 2041 | { |
220e750f | 2042 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
88ebb0a1 MW |
2043 | if (DWARF2_VERSION < 4) |
2044 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); | |
2045 | else | |
2046 | out_abbrev (DW_AT_high_pc, (sizeof_address == 4 | |
2047 | ? DW_FORM_data4 : DW_FORM_data8)); | |
220e750f | 2048 | } |
802f5d9e NC |
2049 | else |
2050 | { | |
413a266c | 2051 | if (DWARF2_FORMAT (info_seg) == dwarf2_format_32bit) |
802f5d9e NC |
2052 | out_abbrev (DW_AT_ranges, DW_FORM_data4); |
2053 | else | |
2054 | out_abbrev (DW_AT_ranges, DW_FORM_data8); | |
2055 | } | |
49fced12 MW |
2056 | out_abbrev (DW_AT_name, DW_FORM_strp); |
2057 | out_abbrev (DW_AT_comp_dir, DW_FORM_strp); | |
2058 | out_abbrev (DW_AT_producer, DW_FORM_strp); | |
220e750f RH |
2059 | out_abbrev (DW_AT_language, DW_FORM_data2); |
2060 | out_abbrev (0, 0); | |
a987bfc9 RH |
2061 | |
2062 | /* Terminate the abbreviations for this compilation unit. */ | |
2063 | out_byte (0); | |
220e750f | 2064 | } |
4dc7ead9 | 2065 | |
220e750f | 2066 | /* Emit a description of this compilation unit for .debug_info. */ |
4dc7ead9 | 2067 | |
220e750f | 2068 | static void |
49fced12 MW |
2069 | out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg, |
2070 | symbolS *name_sym, symbolS *comp_dir_sym, symbolS *producer_sym) | |
220e750f | 2071 | { |
91d6fa6a | 2072 | expressionS exp; |
220e750f | 2073 | symbolS *info_end; |
14e777e0 | 2074 | int sizeof_offset; |
4dc7ead9 | 2075 | |
031e3350 | 2076 | memset (&exp, 0, sizeof exp); |
91d6fa6a NC |
2077 | sizeof_offset = out_header (info_seg, &exp); |
2078 | info_end = exp.X_add_symbol; | |
4dc7ead9 | 2079 | |
220e750f | 2080 | /* DWARF version. */ |
fc0eebac | 2081 | out_two (DWARF2_VERSION); |
4dc7ead9 | 2082 | |
220e750f | 2083 | /* .debug_abbrev offset */ |
6174d9c8 | 2084 | TC_DWARF2_EMIT_OFFSET (section_symbol (abbrev_seg), sizeof_offset); |
4dc7ead9 | 2085 | |
220e750f RH |
2086 | /* Target address size. */ |
2087 | out_byte (sizeof_address); | |
fac0d250 | 2088 | |
220e750f RH |
2089 | /* DW_TAG_compile_unit DIE abbrev */ |
2090 | out_uleb128 (1); | |
fac0d250 | 2091 | |
220e750f | 2092 | /* DW_AT_stmt_list */ |
413a266c AM |
2093 | TC_DWARF2_EMIT_OFFSET (section_symbol (line_seg), |
2094 | (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit | |
2095 | ? 4 : 8)); | |
fac0d250 | 2096 | |
802f5d9e | 2097 | /* These two attributes are emitted if all of the code is contiguous. */ |
220e750f | 2098 | if (all_segs->next == NULL) |
58b5739a | 2099 | { |
220e750f | 2100 | /* DW_AT_low_pc */ |
91d6fa6a NC |
2101 | exp.X_op = O_symbol; |
2102 | exp.X_add_symbol = all_segs->text_start; | |
2103 | exp.X_add_number = 0; | |
2104 | emit_expr (&exp, sizeof_address); | |
220e750f RH |
2105 | |
2106 | /* DW_AT_high_pc */ | |
88ebb0a1 MW |
2107 | if (DWARF2_VERSION < 4) |
2108 | exp.X_op = O_symbol; | |
2109 | else | |
2110 | { | |
2111 | exp.X_op = O_subtract; | |
2112 | exp.X_op_symbol = all_segs->text_start; | |
2113 | } | |
91d6fa6a NC |
2114 | exp.X_add_symbol = all_segs->text_end; |
2115 | exp.X_add_number = 0; | |
2116 | emit_expr (&exp, sizeof_address); | |
58b5739a | 2117 | } |
802f5d9e NC |
2118 | else |
2119 | { | |
eb1fe072 NC |
2120 | /* This attribute is emitted if the code is disjoint. */ |
2121 | /* DW_AT_ranges. */ | |
2122 | TC_DWARF2_EMIT_OFFSET (section_symbol (ranges_seg), sizeof_offset); | |
802f5d9e | 2123 | } |
58b5739a | 2124 | |
49fced12 MW |
2125 | /* DW_AT_name, DW_AT_comp_dir and DW_AT_producer. Symbols in .debug_str |
2126 | setup in out_debug_str below. */ | |
2127 | TC_DWARF2_EMIT_OFFSET (name_sym, sizeof_offset); | |
2128 | TC_DWARF2_EMIT_OFFSET (comp_dir_sym, sizeof_offset); | |
2129 | TC_DWARF2_EMIT_OFFSET (producer_sym, sizeof_offset); | |
2130 | ||
2131 | /* DW_AT_language. Yes, this is probably not really MIPS, but the | |
2132 | dwarf2 draft has no standard code for assembler. */ | |
2133 | out_two (DW_LANG_Mips_Assembler); | |
2134 | ||
72354279 | 2135 | symbol_set_value_now_octets (info_end); |
49fced12 MW |
2136 | } |
2137 | ||
2138 | /* Emit the three debug strings needed in .debug_str and setup symbols | |
2139 | to them for use in out_debug_info. */ | |
2140 | static void | |
2141 | out_debug_str (segT str_seg, symbolS **name_sym, symbolS **comp_dir_sym, | |
2142 | symbolS **producer_sym) | |
2143 | { | |
2144 | char producer[128]; | |
2145 | const char *comp_dir; | |
2146 | const char *dirname; | |
2147 | char *p; | |
2148 | int len; | |
2149 | ||
2150 | subseg_set (str_seg, 0); | |
2151 | ||
48b91938 RH |
2152 | /* DW_AT_name. We don't have the actual file name that was present |
2153 | on the command line, so assume files[1] is the main input file. | |
2154 | We're not supposed to get called unless at least one line number | |
2155 | entry was emitted, so this should always be defined. */ | |
5c4e5fe6 | 2156 | *name_sym = symbol_temp_new_now_octets (); |
7fd3924a | 2157 | if (files_in_use == 0) |
48b91938 | 2158 | abort (); |
a7ed1ca2 NC |
2159 | if (files[1].dir) |
2160 | { | |
3d6b762c JM |
2161 | dirname = remap_debug_filename (dirs[files[1].dir]); |
2162 | len = strlen (dirname); | |
198f1251 TG |
2163 | #ifdef TE_VMS |
2164 | /* Already has trailing slash. */ | |
2165 | p = frag_more (len); | |
2166 | memcpy (p, dirname, len); | |
2167 | #else | |
a7ed1ca2 | 2168 | p = frag_more (len + 1); |
3d6b762c | 2169 | memcpy (p, dirname, len); |
56487c55 | 2170 | INSERT_DIR_SEPARATOR (p, len); |
198f1251 | 2171 | #endif |
a7ed1ca2 | 2172 | } |
48b91938 RH |
2173 | len = strlen (files[1].filename) + 1; |
2174 | p = frag_more (len); | |
2175 | memcpy (p, files[1].filename, len); | |
2176 | ||
220e750f | 2177 | /* DW_AT_comp_dir */ |
5c4e5fe6 | 2178 | *comp_dir_sym = symbol_temp_new_now_octets (); |
3d6b762c | 2179 | comp_dir = remap_debug_filename (getpwd ()); |
220e750f RH |
2180 | len = strlen (comp_dir) + 1; |
2181 | p = frag_more (len); | |
2182 | memcpy (p, comp_dir, len); | |
fac0d250 | 2183 | |
220e750f | 2184 | /* DW_AT_producer */ |
5c4e5fe6 | 2185 | *producer_sym = symbol_temp_new_now_octets (); |
220e750f RH |
2186 | sprintf (producer, "GNU AS %s", VERSION); |
2187 | len = strlen (producer) + 1; | |
2188 | p = frag_more (len); | |
2189 | memcpy (p, producer, len); | |
fac0d250 RH |
2190 | } |
2191 | ||
1e9cc1c2 NC |
2192 | void |
2193 | dwarf2_init (void) | |
2194 | { | |
1e9cc1c2 NC |
2195 | last_seg_ptr = &all_segs; |
2196 | } | |
2197 | ||
2198 | ||
c6cb92c5 NS |
2199 | /* Finish the dwarf2 debug sections. We emit .debug.line if there |
2200 | were any .file/.loc directives, or --gdwarf2 was given, or if the | |
df1c40a7 L |
2201 | file has a non-empty .debug_info section and an empty .debug_line |
2202 | section. If we emit .debug_line, and the .debug_info section is | |
2203 | empty, we also emit .debug_info, .debug_aranges and .debug_abbrev. | |
2204 | ALL_SEGS will be non-null if there were any .file/.loc directives, | |
2205 | or --gdwarf2 was given and there were any located instructions | |
2206 | emitted. */ | |
c6cb92c5 | 2207 | |
fac0d250 | 2208 | void |
a2e22468 | 2209 | dwarf2_finish (void) |
fac0d250 | 2210 | { |
220e750f RH |
2211 | segT line_seg; |
2212 | struct line_seg *s; | |
c6cb92c5 NS |
2213 | segT info_seg; |
2214 | int emit_other_sections = 0; | |
df1c40a7 | 2215 | int empty_debug_line = 0; |
c6cb92c5 NS |
2216 | |
2217 | info_seg = bfd_get_section_by_name (stdoutput, ".debug_info"); | |
2218 | emit_other_sections = info_seg == NULL || !seg_not_empty_p (info_seg); | |
fac0d250 | 2219 | |
df1c40a7 L |
2220 | line_seg = bfd_get_section_by_name (stdoutput, ".debug_line"); |
2221 | empty_debug_line = line_seg == NULL || !seg_not_empty_p (line_seg); | |
2222 | ||
2223 | /* We can't construct a new debug_line section if we already have one. | |
2224 | Give an error. */ | |
2225 | if (all_segs && !empty_debug_line) | |
2226 | as_fatal ("duplicate .debug_line sections"); | |
2227 | ||
2228 | if ((!all_segs && emit_other_sections) | |
2229 | || (!emit_other_sections && !empty_debug_line)) | |
2230 | /* If there is no line information and no non-empty .debug_info | |
2231 | section, or if there is both a non-empty .debug_info and a non-empty | |
2232 | .debug_line, then we do nothing. */ | |
220e750f | 2233 | return; |
fac0d250 | 2234 | |
220e750f | 2235 | /* Calculate the size of an address for the target machine. */ |
9605f328 | 2236 | sizeof_address = DWARF2_ADDR_SIZE (stdoutput); |
fac0d250 | 2237 | |
220e750f RH |
2238 | /* Create and switch to the line number section. */ |
2239 | line_seg = subseg_new (".debug_line", 0); | |
8a7140c3 | 2240 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY | SEC_DEBUGGING); |
fac0d250 | 2241 | |
220e750f | 2242 | /* For each subsection, chain the debug entries together. */ |
ee515fb7 | 2243 | for (s = all_segs; s; s = s->next) |
fac0d250 | 2244 | { |
91d6fa6a NC |
2245 | struct line_subseg *lss = s->head; |
2246 | struct line_entry **ptail = lss->ptail; | |
220e750f | 2247 | |
62e6b7b3 AO |
2248 | /* Reset the initial view of the first subsection of the |
2249 | section. */ | |
2250 | if (lss->head && lss->head->loc.view) | |
2251 | set_or_check_view (lss->head, NULL, NULL); | |
2252 | ||
91d6fa6a | 2253 | while ((lss = lss->next) != NULL) |
220e750f | 2254 | { |
62e6b7b3 AO |
2255 | /* Link the first view of subsequent subsections to the |
2256 | previous view. */ | |
2257 | if (lss->head && lss->head->loc.view) | |
2258 | set_or_check_view (lss->head, | |
2259 | !s->head ? NULL : (struct line_entry *)ptail, | |
2260 | s->head ? s->head->head : NULL); | |
91d6fa6a NC |
2261 | *ptail = lss->head; |
2262 | ptail = lss->ptail; | |
220e750f | 2263 | } |
fac0d250 | 2264 | } |
85a39694 | 2265 | |
220e750f | 2266 | out_debug_line (line_seg); |
85a39694 | 2267 | |
c6cb92c5 | 2268 | /* If this is assembler generated line info, and there is no |
49fced12 MW |
2269 | debug_info already, we need .debug_info, .debug_abbrev and |
2270 | .debug_str sections as well. */ | |
c6cb92c5 | 2271 | if (emit_other_sections) |
220e750f RH |
2272 | { |
2273 | segT abbrev_seg; | |
220e750f | 2274 | segT aranges_seg; |
802f5d9e | 2275 | segT ranges_seg; |
49fced12 MW |
2276 | segT str_seg; |
2277 | symbolS *name_sym, *comp_dir_sym, *producer_sym; | |
4dc7ead9 | 2278 | |
9c2799c2 | 2279 | gas_assert (all_segs); |
7fd3924a | 2280 | |
220e750f RH |
2281 | info_seg = subseg_new (".debug_info", 0); |
2282 | abbrev_seg = subseg_new (".debug_abbrev", 0); | |
2283 | aranges_seg = subseg_new (".debug_aranges", 0); | |
49fced12 | 2284 | str_seg = subseg_new (".debug_str", 0); |
ef99799a | 2285 | |
8a7140c3 NC |
2286 | bfd_set_section_flags (stdoutput, info_seg, |
2287 | SEC_READONLY | SEC_DEBUGGING); | |
2288 | bfd_set_section_flags (stdoutput, abbrev_seg, | |
2289 | SEC_READONLY | SEC_DEBUGGING); | |
2290 | bfd_set_section_flags (stdoutput, aranges_seg, | |
2291 | SEC_READONLY | SEC_DEBUGGING); | |
49fced12 MW |
2292 | bfd_set_section_flags (stdoutput, str_seg, |
2293 | (SEC_READONLY | SEC_DEBUGGING | |
2294 | | SEC_MERGE | SEC_STRINGS)); | |
2295 | str_seg->entsize = 1; | |
ef99799a | 2296 | |
ee515fb7 | 2297 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
ef99799a | 2298 | |
802f5d9e NC |
2299 | if (all_segs->next == NULL) |
2300 | ranges_seg = NULL; | |
2301 | else | |
2302 | { | |
2303 | ranges_seg = subseg_new (".debug_ranges", 0); | |
7fd3924a | 2304 | bfd_set_section_flags (stdoutput, ranges_seg, |
802f5d9e NC |
2305 | SEC_READONLY | SEC_DEBUGGING); |
2306 | record_alignment (ranges_seg, ffs (2 * sizeof_address) - 1); | |
2307 | out_debug_ranges (ranges_seg); | |
2308 | } | |
2309 | ||
220e750f | 2310 | out_debug_aranges (aranges_seg, info_seg); |
413a266c | 2311 | out_debug_abbrev (abbrev_seg, info_seg, line_seg); |
49fced12 MW |
2312 | out_debug_str (str_seg, &name_sym, &comp_dir_sym, &producer_sym); |
2313 | out_debug_info (info_seg, abbrev_seg, line_seg, ranges_seg, | |
2314 | name_sym, comp_dir_sym, producer_sym); | |
220e750f | 2315 | } |
85a39694 | 2316 | } |
ba8826a8 AO |
2317 | |
2318 | /* Perform any deferred checks pertaining to debug information. */ | |
2319 | ||
2320 | void | |
2321 | dwarf2dbg_final_check (void) | |
2322 | { | |
2323 | /* Perform reset-view checks. Don't evaluate view_assert_failed | |
2324 | recursively: it could be very deep. It's a chain of adds, with | |
2325 | each chain element pointing to the next in X_add_symbol, and | |
2326 | holding the check value in X_op_symbol. */ | |
2327 | while (view_assert_failed) | |
2328 | { | |
723dfee7 | 2329 | expressionS *exp; |
ba8826a8 AO |
2330 | symbolS *sym; |
2331 | offsetT failed; | |
2332 | ||
2333 | gas_assert (!symbol_resolved_p (view_assert_failed)); | |
2334 | ||
723dfee7 | 2335 | exp = symbol_get_value_expression (view_assert_failed); |
ba8826a8 AO |
2336 | sym = view_assert_failed; |
2337 | ||
2338 | /* If view_assert_failed looks like a compound check in the | |
2339 | chain, break it up. */ | |
723dfee7 | 2340 | if (exp->X_op == O_add && exp->X_add_number == 0 && exp->X_unsigned) |
ba8826a8 | 2341 | { |
723dfee7 HPN |
2342 | view_assert_failed = exp->X_add_symbol; |
2343 | sym = exp->X_op_symbol; | |
ba8826a8 AO |
2344 | } |
2345 | else | |
2346 | view_assert_failed = NULL; | |
2347 | ||
2348 | failed = resolve_symbol_value (sym); | |
2349 | if (!symbol_resolved_p (sym) || failed) | |
2350 | { | |
2351 | as_bad (_("view number mismatch")); | |
2352 | break; | |
2353 | } | |
2354 | } | |
2355 | } |